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The final exam grade of a statistics class has a skewed distribution with a mean of 78 and a standard deviation or 7.8 if you

The final exam grade of a statistics class has a skewed distribution with a mean of 78 and a standard deviation or 7.8 if you random sample of 36 students selected from this class then what is the probability that the average final exam grade of the sample is between 78 and 80

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