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The grades for the first QMB exam last term was normal distributed with a mean of 81 and a standard deviation of 12 what is

The grades for the first QMB exam last term was normal distributed with a mean of 81 and a standard deviation of 12 what is the probability that a randomly selected student will have a grade less than 70 0.6217 0.1797 0.5664 0.8203

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