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?

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.

Hello ljvilla

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.

Well : 7% of 400 =??

b) if a telemarketer makes 400 calls in a week, find the standard deviation of sales expected.

That depends on the description of "standard deviation". That COULD be within 10% of the 7%, i.e. between 6,3 and 7,7 %.

c) is it unusual to get 57 sales in a week?

See the difference between 7% of 400 and 57, and draw your conclusion!

I suggest you read first once more through your paper and make a summary of the theory involved. Your question seems to indicate that you expect others to have to do your homework. You have to do that yourself. We can only help you and guide you!!

Success !

:)