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'. The grades on a statistics midterm exam were normally distributed with a mean of 72 and a standard deviation of 8. What is the

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'. The grades on a statistics midterm exam were normally distributed with a mean of 72 and a standard deviation of 8. What is the proportion of students received a B grade. What is the probability that a randomly selected student received a 3'8 or above? What is the percent of students that failed the exam

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