You are playing a game where you are rolling a fair 6-sided number cube. it costs $1.00 for every roll. if you roll an even number, you win $3.00. if you roll an odd number, you win nothing. which of the following is the expected value of this game?

a) expected value= $-0.50

b) expected value= $0.50

c) expected value= $1.00

d) expected value= $-1.00