Question

Harlene tosses two number cubes. If a sum of 8 or 12 comes up, she gets 9 points. If not, she loses 2 points. What is the expected value of the number of points for one roll?

Answer 1

Are these your standard number cubes which have faces from 1 to six?

Answer 2

Anyways whatever kind you have multiply the probability of getting a result times its reward and then add up the two cases after you have done the multiplication.