The time it takes for a cheese-and-ham sandwich to be toasted in the School ground floor cafeteria appears to be normally distributed. A random sample of the times for toasting 20 such sandwiches had a sample mean of 166 seconds and a sample standard deviation of 22.3 seconds. What is the value of the upper end-point of the 99% confidence interval for the mean time to toast a cheese-and-ham sandwich? Give your solution accurate to 4 decimal places. Answer: Check Nevt nagae pe here to search hp 立

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