Mathematics, 16.03.2022 14:00 gg808

In order to fairly set the 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 the sample must be selected if he wants to be 95 % confident that the average time is within 15 minutes of the sample average. Assume that the sample standard deviation of all times is 34 minutes

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