HSS-MD.A.2

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- HSS-MD.A.1(+) Define a random variable for a quantity of interest by assigning a numerical value to each event in a sample space; graph the corresponding probability distribution using the same graphical displays as for data distributions.
- HSS-MD.A.2(+) Calculate the expected value of a random variable; interpret it as the mean of the probability distribution.
- HSS-MD.A.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.
- HSS-MD.A.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?

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## HSS-MD.A.2

## (+) Calculate the expected value of a random variable; interpret it as the mean of the probability distribution.

1 Lesson(s)

### Probability Distributions and Expected Value

12th Grade Math »
Unit: Statistics: Using Probability to Make Decisions

12th Grade Math »
Unit: Statistics: Using Probability to Make Decisions

Big Idea:

#### As the semester nears its end, we make beautiful graphs, and briefly consider some deeper ideas that students might see in their future study of statistics.

Standards:

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### Kindergarten

### First grade

### Second grade

### Third Grade

### Fourth grade

### Fifth grade

### Middle School

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

HS Number & Quantity

HS Algebra

HS Functions

HS Geometry

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

Eighth Grade

Ninth and Tenth Grade

Kindergarten

First grade

Second grade

Third Grade

Fourth grade

Fifth grade

Middle School