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the final exam grade of a statistics class has a skewed distribution with mean of 76 and standard deviation of 7.4. if a random sample

the final exam grade of a statistics class has a skewed distribution with mean of 76 and standard deviation of 7.4. if a random sample of 36 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80

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