Mathematics, 20.04.2021 17:40 Kaycieb

The number of hours a certain type of battery will last is distributed normally with a mean of 500 minutes. The
standard deviation is 50 minutes. Out of 240 batteries
tested, how many batteries would you expect to still be
working after 580 minutes?

Can somebody help me with this question?

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The number of hours a certain type of battery will last is distributed normally with a mean of 500...