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Suppose that cars arrive Wendy s drive through at the rate of 40 cars per...

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Suppose that cars arrive Wendy s drive through at the rate of 40 cars per hour between noon and 1 00 p m A random sample of 40 one hour time periods between noon and 1 00 p m is selected and 44 1 is the mean number of cars arriving for this sample a Why is the sampling distribution of the sample mean x approximately normal What is the mean and standard deviation of the sampling distribution of x assuming that 40 and 40 b c What is the probability that a simple random sample of 40 one hour time periods results in a mean of at least 44 1 cars Is this result unusual What might we conclude

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