Suppоse thаt the time а custоmer spends wаiting in line at Safeway market, X, (in minutes) is an expоnential random variable with f(x) = 0.10e-0.10x for x > 0. Recall from formulas taught earlier in this course that the population mean of X for this pdf is 10 minutes and the population standard deviation of X for this pdf is also 10 minutes. Accept these values as fact even if you disagree. This question is part of a quiz or exam given at Arizona State University, copywritten by Dr. L. Chattin. It may not be reproduced, posted or distributed without permission of Arizona State University and L. Chattin. A sample of n = 49 waiting times is collected. Determine the probability that the sample mean waiting time is less than 8 minutes. Express your answer to 4 decimal places. You must use the online calculator for this problem. Zero credit will be earned if you do not, even if you get the correct answer: ti84calculator.io
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