Expected Value

Question

Suppose that 20% of the time Todd eats out twice a week, 35% of the time he eats out once a week, and 45% of the time he doesn't eat out at all in a given week. What is the expected value for the number of times Todd eats out during a week?

Answer 1

2 * .2 + 1 * .35 + 0 * 45 = .75 i.e. less than once per week is the expected value