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You measure 33 randomly selected textbooks' weights, and find they have a mean weight of 80 ounces. Assume the population is normally distributed and has

You measure 33 randomly selected textbooks' weights, and find they have a mean weight of 80 ounces. Assume the population is normally distributed and has a standard deviation of 2.8 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places

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