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Talk Time on a Cell Phone Suppose the "talk time" in digital mode on a Motorola Timeport P8160 is normally distributed with mean 324 minutes and standard deviation 24 minutes.

(a) What percent of the time will a fully charged battery last at least 330 minutes

(b) What is the probability that a random sample of n = 15 batteries results in a mean talk time of at least 330 minutes?

(c) What is the probability that a random sample of n = 30 batteries results in a mean talk time of at least 330 minutes?

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Category:- Statistics and Probability
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