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Common Core State Standards - Mathematics: High School
- Common Core State Standards Adopted: 2011
This correlation lists the recommended Gizmos for this state's curriculum standards. Click any Gizmo title below to go to the Gizmo Details page.
N: Number and Quantity Overview
N.RN: The Real Number System
N.RN.1: Explain how the definition of the meaning of rational exponents follows from extending the properties of integer exponents to those values, allowing for a notation for radicals in terms of rational exponents. For example, we define 51/3 to be the cube root of 5 because we want (51/3)3 = 5(1/3)3 to hold, so (51/3)3 must equal 5.
N.Q: Quantities
N.Q.1: Use units as a way to understand problems and to guide the solution of multi-step problems; choose and interpret units consistently in formulas; choose and interpret the scale and the origin in graphs and data displays.
N.CN: The Complex Number System
N.CN.1: Know there is a complex number i such that i2 = -1, and every complex number has the form a + bi with a and b real.
Points in the Complex Plane - Activity A
N.CN.3: Find the conjugate of a complex number; use conjugates to find moduli and quotients of complex numbers.
Points in the Complex Plane - Activity A
N.CN.4: Represent complex numbers on the complex plane in rectangular and polar form (including real and imaginary numbers), and explain why the rectangular and polar forms of a given complex number represent the same number.
Complex Numbers in Polar Form
Points in the Complex Plane - Activity A
N.CN.6: Calculate the distance between numbers in the complex plane as the modulus of the difference, and the midpoint of a segment as the average of the numbers at its endpoints.
Absolute Value of a Complex Number
N.VM: Vector and Matrix Quantities
N.VM.1: Recognize vector quantities as having both magnitude and direction. Represent vector quantities by directed line segments, and use appropriate symbols for vectors and their magnitudes (e.g., v, |v|, ||v||, v).
N.VM.2: Find the components of a vector by subtracting the coordinates of an initial point from the coordinates of a terminal point.
N.VM.3: Solve problems involving velocity and other quantities that can be represented by vectors.
2D Collisions
Golf Range
Inclined Plane - Simple Machine
N.VM.4: Add and subtract vectors.
N.VM.4.a: Add vectors end-to-end, component-wise, and by the parallelogram rule. Understand that the magnitude of a sum of two vectors is typically not the sum of the magnitudes.
N.VM.4.b: Given two vectors in magnitude and direction form, determine the magnitude and direction of their sum.
N.VM.12: Work with 2 × 2 matrices as a transformations of the plane, and interpret the absolute value of the determinant in terms of area.
A: Algebra
A.SSE: Seeing Structure in Expressions
A.SSE.1: Interpret expressions that represent a quantity in terms of its context.
A.SSE.1.b: Interpret complicated expressions by viewing one or more of their parts as a single entity. For example, interpret P(1+r)n as the product of P and a factor not depending on P.
Simple and Compound Interest
Translating and Scaling Functions
Using Algebraic Expressions
A.SSE.2: Use the structure of an expression to identify ways to rewrite it. For example, see x4 - y4 as (x2)2 - (y2)2, thus recognizing it as a difference of squares that can be factored as (x2 - y2)(x2 + y2).
Factoring Special Products
Modeling the Factorization of ax^{2}+bx+c
Modeling the Factorization of x^{2}+bx+c
A.SSE.3: Choose and produce an equivalent form of an expression to reveal and explain properties of the quantity represented by the expression.
A.SSE.3.a: Factor a quadratic expression to reveal the zeros of the function it defines.
Factoring Special Products
Modeling the Factorization of ax^{2}+bx+c
Modeling the Factorization of x^{2}+bx+c
A.SSE.3.c: Use the properties of exponents to transform expressions for exponential functions. For example the expression 1.15t can be rewritten as (1.151/12) raised to the 12t, which is roughly (1.12) to the 12t to reveal the approximate equivalent monthly interest rate if the annual rate is 15%.
A.APR: Arithmetic with Polynomials & Rational Expressions
A.APR.1: Understand that polynomials form a system analogous to the integers, namely, they are closed under the operations of addition, subtraction, and multiplication; add, subtract, and multiply polynomials.
Addition of Polynomials - Activity A
A.APR.2: Know and apply the Remainder Theorem: For a polynomial p(x) and a number a, the remainder on division by x - a is p(a), so p(a) = 0 if and only if (x - a) is a factor of p(x).
Dividing Polynomials Using Synthetic Division
Polynomials and Linear Factors
A.APR.3: Identify zeros of polynomials when suitable factorizations are available, and use the zeros to construct a rough graph of the function defined by the polynomial.
Polynomials and Linear Factors
Quadratics in Factored Form
A.CED: Creating Equations
A.CED.1: Create equations and inequalities in one variable and use them to solve problems. Include equations arising from linear and quadratic functions, and simple rational and exponential functions.
Air Track
Arithmetic Sequences
Geometric Sequences
Golf Range
Half-life
Road Trip (Problem Solving)
A.CED.2: Create equations in two or more variables to represent relationships between quantities; graph equations on coordinate axes with labels and scales.
2D Collisions
Air Track
Atwood Machine
Golf Range
Gravitational Force
Half-life
A.CED.3: Represent constraints by equations or inequalities, and by systems of equations and/or inequalities, and interpret solutions as viable or nonviable options in a modeling context. For example, represent inequalities describing nutritional and cost constraints on combinations of different foods.
Linear Programming - Activity A
Maximize Area
Minimize Perimeter
A.CED.4: Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations. For example, rearrange Ohm's law V = IR to highlight resistance R.
Solving Formulas for any Variable
A.REI: Reasoning with Equations & Inequalities
A.REI.1: Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.
Modeling One-Step Equations - Activity A
Modeling and Solving Two-Step Equations
Solving Formulas for any Variable
A.REI.3: Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.
Modeling One-Step Equations - Activity A
Modeling and Solving Two-Step Equations
Solving Linear Inequalities using Addition and Subtraction
Solving Linear Inequalities using Multiplication and Division
A.REI.4: Solve quadratic equations in one variable.
A.REI.4.b: Solve quadratic equations by inspection (e.g., for x2 = 49), taking square roots, completing the square, the quadratic formula and factoring, as appropriate to the initial form of the equation. Recognize when the quadratic formula gives complex solutions and write them as a ± bi for real numbers a and b.
A.REI.5: Prove that, given a system of two equations in two variables, replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions.
Systems of Linear Equations - Activity A
A.REI.6: Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.
Solving Linear Systems by Graphing
Systems of Linear Equations - Activity A
A.REI.7: Solve a simple system consisting of a linear equation and a quadratic equation in two variables algebraically and graphically. For example, find the points of intersection between the line y = -3x and the circle x2 + y2 = 3.
System of Two Quadratic Inequalities
A.REI.10: Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).
Circles
Ellipse - Activity A
Hyperbola - Activity A
Parabolas - Activity A
Using Tables, Rules and Graphs
A.REI.11: Explain why the x-coordinates of the points where the graphs of the equations y = f(x) and y = g(x) intersect are the solutions of the equation f(x) = g(x); find the solutions approximately, e.g., using technology to graph the functions, make tables of values, or find successive approximations. Include cases where f(x) and/or g(x) are linear, polynomial, rational, absolute value, exponential, and logarithmic functions
Solving Equations By Graphing Each Side
Solving Linear Systems by Graphing
A.REI.12: Graph the solutions to a linear inequality in two variables as a half-plane (excluding the boundary in the case of a strict inequality), and graph the solution set to a system of linear inequalities in two variables as the intersection of the corresponding half-planes.
Linear Inequalities in Two Variables - Activity A
F: Functions
F.IF: Interpreting Functions
F.IF.1: Understand that a function from one set (called the domain) to another set (called the range) assigns to each element of the domain exactly one element of the range. If f is a function and x is an element of its domain, then f(x) denotes the output of f corresponding to the input x. The graph of f is the graph of the equation y = f(x).
Function Machines 1 (Functions and Tables)
Function Machines 2 (Functions, Tables, and Graphs)
Function Machines 3 (Functions and Problem Solving)
Introduction to Functions
Using Tables, Rules and Graphs
F.IF.2: Use function notation, evaluate functions for inputs in their domains, and interpret statements that use function notation in terms of a context.
Absolute Value with Linear Functions - Activity B
Quadratic and Absolute Value Functions
Translating and Scaling Functions
F.IF.4: For a function that models a relationship between two quantities, interpret key features of graphs and tables in terms of the quantities, and sketch graphs showing key features given a verbal description of the relationship. Key features include: intercepts; intervals where the function is increasing, decreasing, positive, or negative; relative maximums and minimums; symmetries; end behavior; and periodicity
Disease Spread
Distance-Time Graphs
Distance-Time and Velocity-Time Graphs
Food Chain
Period of Mass on a Spring
Period of a Pendulum
Rabbit Population by Season
F.IF.5: Relate the domain of a function to its graph and, where applicable, to the quantitative relationship it describes. For example, if the function h(n) gives the number of person-hours it takes to assemble n engines in a factory, then the positive integers would be an appropriate domain for the function
Functions Involving Square Roots
General Form of a Rational Function
Introduction to Functions
Radical Functions
Rational Functions
F.IF.6: Calculate and interpret the average rate of change of a function (presented symbolically or as a table) over a specified interval. Estimate the rate of change from a graph.
Distance-Time Graphs
Distance-Time and Velocity-Time Graphs
F.IF.7: Graph functions expressed symbolically and show key features of the graph, by hand in simple cases and using technology for more complicated cases
F.IF.7.a: Graph linear and quadratic functions and show intercepts, maxima, and minima.
Linear Functions
Quadratic Functions
Quadratics in Factored Form
Quadratics in Vertex Form - Activity A
Slope-Intercept Form of a Line - Activity A
Using Tables, Rules and Graphs
F.IF.7.b: Graph square root, cube root, and piecewise-defined functions, including step functions and absolute value functions.
Absolute Value of a Quadratic Function
Absolute Value with Linear Functions - Activity A
Functions Involving Square Roots
Quadratic and Absolute Value Functions
Radical Functions
F.IF.7.c: Graph polynomial functions, identifying zeros when suitable factorizations are available, and showing end behavior.
Cubic Function Activity
Fourth-Degree Polynomials - Activity A
Polynomials and Linear Factors
Quadratics in Factored Form
Quadratics in Vertex Form - Activity A
Roots of a Quadratic
Zap It! Game
F.IF.7.d: Graph rational functions, identifying zeros and asymptotes when suitable factorizations are available, and showing end behavior.
General Form of a Rational Function
Rational Functions
F.IF.7.e: Graph exponential and logarithmic functions, showing intercepts and end behavior, and trigonometric functions, showing period, midline, and amplitude.
Cosine Function
Exponential Functions - Activity A
Exponential Growth and Decay - Activity A
Logarithmic Functions - Activity A
Logarithmic Functions: Translating and Scaling
Sine Function
Tangent Function
F.IF.8.a: Use the process of factoring and completing the square in a quadratic function to show zeros, extreme values, and symmetry of the graph, and interpret these in terms of a context.
Factoring Special Products
Modeling the Factorization of ax^{2}+bx+c
Modeling the Factorization of x^{2}+bx+c
F.IF.8.b: Use the properties of exponents to interpret expressions for exponential functions. For example, identify percent rate of change in functions such as y = (1.02)t, y = (0.97)t, y = (1.01)12t, y = (1.2)t/10, and classify them as representing exponential growth or decay.
Exponential Growth and Decay - Activity A
Simple and Compound Interest
F.BF: Building Functions
F.BF.1: Write a function that describes a relationship between two quantities
F.BF.1.a: Determine an explicit expression, a recursive process, or steps for calculation from a context.
Arithmetic Sequences
Geometric Sequences
Golf Range
Gravitational Force
F.BF.2: Write arithmetic and geometric sequences both recursively and with an explicit formula, use them to model situations, and translate between the two forms
Arithmetic Sequences
Geometric Sequences
F.BF.3: Identify the effect on the graph of replacing f(x) by f(x) + k, k f(x), f(kx), and f(x + k) for specific values of k (both positive and negative); find the value of k given the graphs. Experiment with cases and illustrate an explanation of the effects on the graph using technology. Include recognizing even and odd functions from their graphs and algebraic expressions for them.
Exponential Functions - Activity A
Logarithmic Functions - Activity A
Reflections of a Linear Function
Reflections of a Quadratic Function
Translating and Scaling Functions
Translating and Scaling Sine and Cosine Functions - Activity A
F.BF.4: Find inverse functions.
F.BF.4.a: Solve an equation of the form f(x) = c for a simple function f that has an inverse and write an expression for the inverse. For example, f(x) =2 x3 or f(x) = (x+1)/(x-1) for x ? 1.
Function Machines 3 (Functions and Problem Solving)
F.BF.4.b: Verify by composition that one function is the inverse of another.
Logarithmic Functions - Activity A
F.LE: Linear, Quadratic, and Exponential Models
F.LE.1: Distinguish between situations that can be modeled with linear functions and with exponential functions.
F.LE.1.a: Prove that linear functions grow by equal differences over equal intervals, and that exponential functions grow by equal factors over equal intervals.
Linear Functions
Simple and Compound Interest
F.LE.1.b: Recognize situations in which one quantity changes at a constant rate per unit interval relative to another.
Arithmetic Sequences
Distance-Time Graphs
Distance-Time and Velocity-Time Graphs
Linear Functions
Simple and Compound Interest
F.LE.1.c: Recognize situations in which a quantity grows or decays by a constant percent rate per unit interval relative to another.
Drug Dosage
Dye Elimination
Exponential Growth and Decay - Activity A
Half-life
F.LE.2: Construct linear and exponential functions, including arithmetic and geometric sequences, given a graph, a description of a relationship, or two input-output pairs (include reading these from a table).
Defining a Line with Two Points
Exponential Functions - Activity A
Point-Slope Form of a Line - Activity A
Slope-Intercept Form of a Line - Activity A
F.LE.3: Observe using graphs and tables that a quantity increasing exponentially eventually exceeds a quantity increasing linearly, quadratically, or (more generally) as a polynomial function.
F.LE.5: Interpret the parameters in a linear or exponential function in terms of a context.
Arithmetic Sequences
Distance-Time Graphs
Distance-Time and Velocity-Time Graphs
Exponential Growth and Decay - Activity A
Half-life
Simple and Compound Interest
F.T: Trigonometric Functions
F.T.2: Explain how the unit circle in the coordinate plane enables the extension of trigonometric functions to all real numbers, interpreted as radian measures of angles traversed counterclockwise around the unit circle.
F.T.4: Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric functions.
F.T.5: Choose trigonometric functions to model periodic phenomena with specified amplitude, frequency, and midline
F.T.9: Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
Simplifying Trigonometric Expressions
Sum and Difference Identities for Sine and Cosine
G: Geometry
G.CO: Congruence
G.CO.1: Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.
Construct Parallel and Perpendicular Lines
Constructing Congruent Segments and Angles
G.CO.2: Represent transformations in the plane using, e.g., transparencies and geometry software; describe transformations as functions that take points in the plane as inputs and give other points as outputs. Compare transformations that preserve distance and angle to those that do not (e.g., translation versus horizontal stretch).
Dilations
Reflections
Rock Art (Transformations)
Rotations, Reflections and Translations
Translations
G.CO.3: Given a rectangle, parallelogram, trapezoid, or regular polygon, describe the rotations and reflections that carry it onto itself.
G.CO.4: Develop definitions of rotations, reflections, and translations in terms of angles, circles, perpendicular lines, parallel lines, and line segments.
Dilations
Reflections
Rotations, Reflections and Translations
Translations
G.CO.5: Given a geometric figure and a rotation, reflection, or translation, draw the transformed figure using, e.g., graph paper, tracing paper, or geometry software. Specify a sequence of transformations that will carry a given figure onto another.
Dilations
Reflections
Rotations, Reflections and Translations
Translations
G.CO.6: Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure; given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent.
Proving Triangles Congruent
Reflections
Rotations, Reflections and Translations
Translations
G.CO.8: Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.
G.CO.9: Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.
Investigating Angle Theorems - Activity A
G.CO.10: Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.
Classifying Triangles
Isosceles and Equilateral Triangles
Triangle Angle Sum - Activity A
Triangle Inequalities
G.CO.11: Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.
Parallelogram Conditions
Special Quadrilaterals
G.CO.12: Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.). Copying a segment; copying an angle; bisecting a segment; bisecting an angle; constructing perpendicular lines, including the perpendicular bisector of a line segment; and constructing a line parallel to a given line through a point not on the line.
Construct Parallel and Perpendicular Lines
Constructing Congruent Segments and Angles
G.SRT: Similarity, Right Triangles, and Trigonometry
G.SRT.1: Verify experimentally the properties of dilations given by a center and a scale factor:
G.SRT.1.b: The dilation of a line segment is longer or shorter in the ratio given by the scale factor.
Dilations
Similar Figures - Activity A
G.SRT.4: Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity.
Pythagorean Theorem - Activity B
G.SRT.5: Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.
Perimeters and Areas of Similar Figures
Similarity in Right Triangles
G.SRT.6: Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
Sine and Cosine Ratios - Activity A
Tangent Ratio
G.SRT.7: Explain and use the relationship between the sine and cosine of complementary angles.
Sine and Cosine Ratios - Activity A
G.SRT.8: Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems
Distance Formula - Activity A
Geoboard: The Pythagorean Theorem
Pythagorean Theorem - Activity B
Sine and Cosine Ratios - Activity A
Tangent Ratio
G.C: Circles
G.C.1: Prove that all circles are similar.
G.C.2: Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle.
G.C.5: Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.
G.GPE: Expressing Geometric Properties with Equations
G.GPE.1: Derive the equation of a circle of given center and radius using the Pythagorean Theorem; complete the square to find the center and radius of a circle given by an equation.
Circles
Distance Formula - Activity A
Geoboard: The Pythagorean Theorem
Pythagorean Theorem - Activity B
G.GPE.2: Derive the equation of a parabola given a focus and directrix.
Parabola with Horizontal Directrix
Parabolas - Activity A
G.GPE.3: Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
Ellipse - Activity A
Hyperbola - Activity A
G.GPE.7: Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula
G.GMD: Geometric Measurement and Dimension
G.GMD.1: Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone. Use dissection arguments, Cavalieri's principle, and informal limit arguments.
Circle: Circumference and Area
Prisms and Cylinders - Activity A
Pyramids and Cones - Activity A
G.GMD.3: Use volume formulas for cylinders, pyramids, cones, and spheres to solve problems.
Prisms and Cylinders - Activity A
Pyramids and Cones - Activity A
S: Statistics
S.ID: Interpreting Categorical and Quantitative Data
S.ID.1: Represent data with plots on the real number line (dot plots, histograms, and box plots).
Box-and-Whisker Plots
Exploring Data Using Histograms
Line Plots
S.ID.2: Use statistics appropriate to the shape of the data distribution to compare center (median, mean) and spread (interquartile range, standard deviation) of two or more different data sets.
Box-and-Whisker Plots
Describing Data Using Statistics
Sight vs. Sound Reactions
S.ID.3: Interpret differences in shape, center, and spread in the context of the data sets, accounting for possible effects of extreme data points (outliers).
Populations and Samples
Reaction Time 1 (Graphs and Statistics)
Sight vs. Sound Reactions
S.ID.6: Represent data on two quantitative variables on a scatter plot, and describe how the variables are related.
S.ID.6.a: Fit a function to the data; use functions fitted to data to solve problems in the context of the data. Use given functions or choose a function suggested by the context. Emphasize linear, quadratic, and exponential models.
Lines of Best Fit Using Least Squares - Activity B
Solving Using Trend Lines
S.ID.6.b: Informally assess the fit of a function by plotting and analyzing residuals.
Lines of Best Fit Using Least Squares - Activity B
S.ID.6.c: Fit a linear function for a scatter plot that suggests a linear association.
S.ID.7: Interpret the slope (rate of change) and the intercept (constant term) of a linear model in the context of the data.
Determining a Spring Constant
Distance-Time Graphs
Modeling Linear Systems - Activity A
S.ID.8: Compute (using technology) and interpret the correlation coefficient of a linear fit.
S.IC: Making Inferences and Justifying Conclusions
S.IC.4: Use data from a sample survey to estimate a population mean or proportion; develop a margin of error through the use of simulation models for random sampling.
Estimating Population Size
Polling: City
Polling: Neighborhood
S.CP: Conditional Probability and Rules of Probability
S.CP.1: Describe events as subsets of a sample space (the set of outcomes) using characteristics (or categories) of the outcomes, or as unions, intersections, or complements of other events (?or,? ?and,? ?not?).
Compound Independent Events
Compound Independent and Dependent Events
Probability Simulations
S.CP.2: Understand that two events A and B are independent if the probability of A and B occurring together is the product of their probabilities, and use this characterization to determine if they are independent.
Compound Independent and Dependent Events
S.CP.3: Understand the conditional probability of A given B as P(A and B)/P(B), and interpret independence of A and B as saying that the conditional probability of A given B is the same as the probability of A, and the conditional probability of B given A is the same as the probability of B.
Compound Independent and Dependent Events
S.CP.8: Apply the general Multiplication Rule in a uniform probability model, P(A and B) = P(A)P(B|A) = P(B)P(A|B), and interpret the answer in terms of the model.
Compound Independent and Dependent Events
S.CP.9: Use permutations and combinations to compute probabilities of compound events and solve problems.
Permutations
Permutations and Combinations
S.MD: Using Probability to Make Decisions
S.MD.3: Develop a probability distribution for a random variable defined for a sample space in which theoretical probabilities can be calculated; find the expected value. For example, find the theoretical probability distribution for the number of correct answers obtained by guessing on all five questions of a multiple-choice test where each question has four choices, and find the expected grade under various grading schemes.
S.MD.4: Develop a probability distribution for a random variable defined for a sample space in which probabilities are assigned empirically; find the expected value. For example, find a current data distribution on the number of TV sets per household in the United States, and calculate the expected number of sets per household. How many TV sets would you expect to find in 100 randomly selected households?
Content correlation last revised: 12/10/2010