At opening time at a service garage, the probability that 1 automobile is in line is 0.10, the probability that 2 automobiles are in line is 0.35, the probability that 3 automobiles are in line is 0.35, and the probability that 4 automobiles are in line is 0.20. What is the expected number of automobiles lined up at opening?

2

3

2.5

2.65