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In order to fairly set flat rates for auto mechanics, a shop foreman needs to...

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Basic Math

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In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. How large a sample must he select if he wants to be 99% confident that the true average time iswithin 15 minutes of the sample average?Assume the standard deviation of all times is 30minutes.275266

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