Computing probability, mean and standard deviation for the given information.
Assume that a telemarketer makes sales on 7% of all his calls.
a.If a telemarketer makes 400 calls in a week, find the mean number of sales expected.
b.If a telemarketer makes 400 calls in a week, find the standard deviation of sales expected.
c.Is it unusual to get 57 sales in a week? Why or Why not?
d.If 80 calls are made in a day, find the probability that there are exactly 4 sales.
e.If 80 calls are made in a day, find the probability that there are at least 4 sales.