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Mathematics, 15.04.2021 06:10 ununoctrium4414

The talk-time battery life of a group of cell phones is normally disributed with a mean of 5
hours and a standard deviation of 15 minutes.
a)what percent of the phones have a battery life of at least 4 hours and 45 minutes? b)what percent of the phones have a battery life between 4.5 hours and 5.25 hours? c)what percent of the phones have a battery life less than 5 hours of greater than 5.5 hours?

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The talk-time battery life of a group of cell phones is normally disributed with a mean of 5
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