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time spent on a certain social networking website has a mean of 23 minutes per visit. Assume that time spent on the social networking site

time spent on a certain social networking website has a mean of 23 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7 minutes.

a. elect a random sample of 25 sessions, what is the probability that the sample mean is between 22.5 and 23.5 minutes?

three decimal places

b. If you select a random sample of 25 sessions, what is the probability that the sample mean is between 22 and 23 minutes?

three decimal places

c. If you select a random sample of 100 sessions, what is the probability that the sample mean is between 22.5 and 23.5 minutes?

three decimal places

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