Page 102 - Probability Demystified

CHAPTER 5 Odds and Expectation 91

11. When a game is fair the expected value would be

a. 1
b. 0
c. 1
d. 0.5
12. When three coins are tossed, what is the expected value of the number
of heads?
a. 1
b. 2
c. 1.5
d. 2.5
13. A special die is made with 1 one, 2 twos, 3 threes. What is the
expected number of spots for one roll?
1
a. 3
2
2
b. 1
3
c. 2
1
d. 2
3
14. Two hundred raffle tickets are sold for $1.00 each. One prize of $75 is
awarded. What is the expected value if a person purchases one ticket?

a. $0.625
b. $0.625
c. $1.75
d. $1.75

15. A box contains 5 one dollar bills, 3 five dollar bills, and 2 ten dollar
bills. A person selects one bill at random and wins that bill. How
much should the person pay to play the game if it is to be fair?
a. $2.00
b. $5.00
c. $3.00
d. $4.00