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Time spent using? e-mail per session is normally? distributed, with mu equals ?=12 minutes and sigma...

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Basic Math

Time spent using? e-mail per session is normally? distributed,with mu equals ?=12 minutes and sigma equals ?=3 minutes. Assumethat the time spent per session is normally distributed. Completeparts? (a) through? (d). b) If you select a random sample of 50?sessions, what is the probability that the sample mean is between11.5 and 12 ?minutes?

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