Suppose that the life-length of a fully-charged cellphone, Ask an Expert

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Suppose that the life-length of a fully-charged cellphone battery is normally distributed with a mean of 180 minutes with a standard deviation of 20 minutes.

(a) What percent of fully-charged cell-phone batteries have a life-length more than 191 minutes?

(b) 79.95% of fully-charged cell-phone batteries have a life-length more than how many minutes?

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Statistics and Probability, Statistics

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