you measure 20 textbooks weight and find they have a mean weight of 34 ounces assume the population standard derivation is 10.2 ounces based on this construct a 90% confidence interval for the true population mean textbook weight give your answers as a decimals to two places..
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by the empirical rule, 95% of the population is within 2 standard deviations of the mean
55 + or - 2(9.2) = 55+ or - 18.4 = (36.6,73.4)
95% of the population falls between 36.6 and 73.4 ounces
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