AP®︎ Statistics (pre-2026): Topic 4.8 Flashcards

Master key terms and definitions for Topic 4.8 of AP Statistics (pre-2026) – Mean and Standard Deviation of Random Variables to help you prep for quizzes and the AP exam.

This course has been archived. The College Board updated AP Statistics for the 2026–27 school year, and the units and topics changed.
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Term

Parameter

Definition

A fixed numerical value describing a population characteristic or a random variable's distribution.

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Parameter
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A fixed numerical value describing a population characteristic or a random variable's distribution.

VAR-5.CVAR-5.C.1
Variance of a Discrete Random Variable
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The probability-weighted average of squared deviations from the mean.

VAR-5.C
Interpreting Mean and Standard Deviation in Context
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State the average and typical spread using the variable's units and the population context.

VAR-5.DVAR-5.D.1
Mean / Expected Value of a Discrete Random Variable
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The long-run average, found by summing each value multiplied by its probability.

VAR-5.CVAR-5.C.2
Standard Deviation of a Discrete Random Variable
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The square root of the probability-weighted squared deviations from the mean.

VAR-5.CVAR-5.C.3