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The batteries from a certain manufacturer have a mean lifetime of 820 hours, with a standard deviation of 70 hours. Assuming that the lifetimes are

The batteries from a certain manufacturer have a mean lifetime of 820 hours, with a standard deviation of 70 hours.

Assuming that the lifetimes are normally distributed, complete the following statements.

(a) Approximately ____ of the batteries have lifetimes between 750 hours and 890 hours.

b) Approximately 95% of the batteries have lifetimes between hours and hours.

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