A Wendy's manager performed a study to determine the probability distribution for the number of people waiting in line during lunch. The results are as follows:

No. Waiting	Probability
2	.25
3	.25
5	.35
6	.05
7	.10

(a) What is the mean number of people waiting in line?

(b) What is the standard deviation for the number of people waiting in line?

(c) What is the probability that there are 5 or more people waiting in line given we have at most six people in the line?