(Answered) According to a social medianbspblog time spent on a certain

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According to a social media? blog, time spent on a certain social networking website has a mean of 18 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 3 minutes. Complete parts? (a) through? (d) below.

a. If you select a random sample of 25 ?sessions, what is the probability that the sample mean is between 17.5 and 18.5?

b. If you select a random sample of 25 sessions, what is the probability that the sample mean is between 17 and 18 ?minutes?

c. If you select a random sample of 100 ?sessions, what is the probability that the sample mean is between 17.5 and 18.5 ?minutes?

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