Question

Select the correct answer.
Nina goes to the supermarket 0, 1, or 2 times in a week. The probability that she goes 0 days is 0.2, the probability that she goes 1 day is 0.50, and the probability that she goes 2 days is 0.30. What is the expected value of the number of days per week on which Nina goes to the supermarket?

A.
0.8

B.
1.1

C.
1.5

D.
1.75

Answer 1

Expected value = 0(0.2) + 1(0.50) + 2(0.30) = 0 + 0.50 + 0.60 = 1.10.

Answer: B.