Expected Value of a Random Variable Answers

1. E(X) = 2

2. E(Z) = 11.7

3. E(W) = 0

4. E(X) = 1

5. E(X) = 1.5

6. E(X) = 7

7. a. k = 0.1

b. E(Y) = 5.4

8. E(number of tails) = 1

9. The average return (expected value) on one$1.00 ticket is $0.70

10. The expected gain to the gambler is -$0.33