Mathematics, 27.02.2020 23:59 impura12713

The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 6%.

a. What is the approximate probability that the sample mean tip percentage for a random sample of 40 bills is between 16% and 19%.
b. If the sample size had been 15 rather than 40, could the probability requested in part (a) be calculated from the given information?

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The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 6%.