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You measure 39 randomly selected textbooks' weights, and find they have a mean weight of 55 ounces. Assume the population standard deviation is 5.7 ounces.

You measure 39 randomly selected textbooks' weights, and find they have a mean weight of 55 ounces. Assume the population standard deviation is 5.7 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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