The discrete random variable X is the number of passages waiting at a bus stop. the table below shows the probability distribution for X. What is the expected value E(X) for this distribution?

X 0 1 2 3 Total

P(X) .40 .30 .20 .10 1.00

Options

a. 1.1

b. 1.0

c. 1.7

d. 1.9