SOLUTION: 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 35.0 hours and a
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-> SOLUTION: 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 35.0 hours and a
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Question 735178: 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 35.0 hours and a standard deviation of 5.5 hours. As a part of its quality assurance program, Power+, Inc. tests samples of 25 batteries.
(a) What is the standard error of the distribution of the sample mean? (Round your answer to 1 decimal place.)
(b)
What proportion of the samples will have a mean useful life of more than 36 hours? (Round z value to 2 decimal places and final answer to 4 decimal places.)
(c)
What proportion of the sample will have a mean useful life greater than 34.5 hours? (Round z value to 2 decimal places and final answer to 4 decimal places.)
(e) What proportion of the sample will have a mean useful life between 34.5 and 36.0 hours? (Round z value to 2 decimal places and final answer to 4 decimal places.) Answer by lynnlo(4176) (Show Source):
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