Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.4 , 0.2 , and 0.4 , respectively. What is the expected number of books a customer will purchase?

Expected number of books = 1.0

Step-by-step explanation:

Expected number of books, E (x) = ∑xp (x)

∑ = Summation

x = books

p (x) = probability of purchasing a book

E (x) = (0*0.4) + (1*0.2) + (2*0.4)

E (x) = 0 + 0.2 + 0.8 = 1.0