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You measure 30 randomly selected textbooks' weights, and find they have a mean weight of 52 ounces. Assume the population standard deviation is 9.8 ounces.

You measure 30 randomly selected textbooks' weights, and find they have a mean weight of 52 ounces. Assume the population standard deviation is 9.8 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.

Give your answers as decimals, to two places

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