According to a social mediablog, time spent on a certain social networking website has a mean of 21

21 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7

7 minutes. Complete parts(a) through(d) below.

A. If you select a random sample of 36

36 sessions, what is the probability that the sample mean is between 20.5

20.5 and 21.5 minutes?

(Round to three decimal places asneeded.)

B. If you select a random sample of 36

36 sessions, what is the probability that the sample mean is between 20

20 and 21 minutes?

(Round to three decimal places asneeded.)

c. If you select a random sample of 100 sessions, what is the probability that the sample mean is between 20.5 and 21.5 minutes?