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You measure 42 backpacks' weights, and find they have a mean weight of 55 ounces. Assume the population standard deviation is 12.4 ounces. Based on

You measure 42 backpacks' weights, and find they have a mean weight of 55 ounces. Assume the population standard deviation is 12.4 ounces. Based on this, construct a 90% confidence interval for the true population mean backpack weight. Give your answers as decimals, to two places ounces

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