tyriquemorgan589 tyriquemorgan589

02-01-2023
Mathematics

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The talk time battery life of a group of cell phones is normally distributed with a mean of 5 hours and a standard deviation of 15 minutes.
a. [complete] what percent of the phones have a battery life at least 4 hours and 45 minutes? (answer: 84%)

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 five hours or greater than 5.5 hours?

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