(Answered) Question a company that makes toaster ovens has done

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Question: A company that makes toaster ovens has done extensive testing on the accuracy of its temperaturesetting mechanism. For a previous toaster model of this company, the standard deviation of the temperatures when the mechanism is set for 350°F is 5.78°. Assume that this is the population standard deviation for a new toaster model that uses the same temperature mechanism. How large a sample must be taken so that the estimate of the mean temperature when the mechanism is set for 350°F is within 1.25°of the population mean temperature? Use a 95% confidence level.

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