school
Acemy

Mean and Standard Deviation of Random Variables

AP Statistics· difficulty 3/5

X has E(X) = 5 and E(X^2) = 30.

Quantity Value E(X) 5 E(X^2) 30 Var(X) ?

What is Var(X)?

  • A

    35

  • B

    30

  • C

    25

  • D

    5

    check_circle

Explanation

Var(X) = E(X^2) - [E(X)]^2 = 30 - 25 = 5.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode