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How long does a customer have to wait until their order is complete? A random sample of 100 orders showed a sample mean 34.2 minutes

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How long does a customer have to wait until their order is complete? A random sample of 100 orders showed a sample mean 34.2 minutes with a standard deviation 9.7 minutes. Obtain the 95% confidence interval for the order completion time. [28.18 , 40.21] [31.21 , 34.19] [30.05 , 38.35] [32.27 , 36.12]

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