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Battery Lifetime Narrative The Lifetime of a Particular Type of Battery Is Normally

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Battery Lifetime Narrative
The lifetime of a particular type of battery is normally distributed with a mean of 1100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to a tire retailer.
-Refer to Battery Lifetime Narrative. What is the probability the average lifetime of these 400 batteries is between 1097 and 1104 days?

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P(1097blured image blured image blured image 1104) = P(...

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