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Time spent using e-mail per session is normally distributed, with m = 9 minutes and s =...

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Question

Basic Math

Time spent using e-mail per session is normallydistributed,
with m = 9 minutes and s = 2 minutes. If you select a random
sample of 25 sessions,
a. what is the probability that the sample mean is between 8.8and
9.2 minutes?
b. what is the probability that the sample mean is between 8.5and
9 minutes?

c. If you select a random sample of 100 sessions, what is theprob-
ability that the sample mean is between 8.8 and 9.2 minutes?

d. Explain the difference in the results of (a) and (c).

Answer & Explanation Solved by verified expert
4.3 Ratings (601 Votes)
Solution Given thatmean 9standard deviation 2n 25 9 n 2 25 04a P88 92 P88 9 04 92 9    See Answer
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