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The quality control manager of a Taco Bell restaurant wants to analyze the length of...

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The quality control manager of a Taco Bell restaurant wants to analyze the length of time that a car spends at the drive through window waiting for an order It is determined that the mean time spent at the window is 61 3 seconds with a standard deviation of 13 2 seconds The distribution of time spent at the window is skewed right a What sample size is required to obtain probabilities regarding the sample mean using a normal model b The quality control manager wishes to use a new system designed to get cars through faster A random sample of 40 cars results in a mean time spent at the window of 56 8 seconds What is the probability of obtaining a sample mean of 56 8 seconds or less from the population described above Do you think the new system is effective Treat the next 55 cars that arrive as a random sample There is a 10 chance the mean time will be at or below seconds C

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