11. Discrete Probability

Expected Value — Quiz

Test your understanding of expected value with 5 practice questions.

Practice Questions

Question 1

What does the expected value of a discrete random variable represent?

Question 2

If $X$ takes values $0$, $1$, and $2$ with probabilities $0.2$, $0.5$, and $0.3$, respectively, what is $E(X)$?

Question 3

What is the expected value of a fair die roll?

Question 4

A game pays $4$ with probability $0.25$, pays $0$ with probability $0.5$, and loses $2$ with probability $0.25$. What is the expected value?

Question 5

If $E(X)=7$, what is $E(2X+3)$?