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help with statistics homework

Statistics
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Power+, Inc. produces AA batteries used in remote controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 37 hours and a standard deviation of 5.5 hours. As a part of its quality assurance program. Power+, Inc test samples of 9 batteries?

a) What proportion of the sample will have a mean useful life of more than 38.5 hours? ( Round z value to 2 decimal places and final answer to 4 decimal places)

Apr 11th, 2015

z = 38.5-37 / 5.5/sqrt9 = 0.82

p = 0.2061


Apr 11th, 2015

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