A company that makes toaster ovens has done extensive testing on the accuracy of its temperature setting mechanism. For a previous toaster model of this company, the standard deviation of the temperatures when the mechanism is set for 350oF is 5.78o. 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 350oF is within 1.25o of the population mean temperature? Use a 95% confidence level.