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The grades for the first QMB exam last term was normally distributed with a mean of 81 and a standard deviation of 12. The interval

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The grades for the first QMB exam last term was normally distributed with a mean of 81 and a standard deviation of 12. The interval around the mean that contains 68% of the grades is O 69, 93 0 75, 95 57, 105 None of the answers presented are correct

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