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A random sample of n = 58 customers at a fast-food restaurant had a mean bill of x = $9.63. If the population standard deviation

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A random sample of n = 58 customers at a fast-food restaurant had a mean bill of x = $9.63. If the population standard deviation is o = $0.89, find the 91% confidence interval (including units) of the mean bill for all customers. Assume the variable is normally distributed and state the distribution used to find the interval

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