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Suppose the life of a particular brand of calculator battery is approximately normally distributed with a...

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 9 hours.

What is the probability that 9 randomly sampled batteries from the population will have a sample mean life of between 70 and 80 ​hours?

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milcah answered 11 months ago
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