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The final exam grade of a statistics class has a skewed distribution with mean of 79.8 and standard deviation of 8.2. If a random sample

The final exam grade of a statistics class has a skewed distribution with mean of 79.8 and standard deviation of 8.2. If a random sample of 45 students selected from this class, then what is the probability that the average final exam grade of this sample is between 80 and 83?

When I do the SQRT(45) my answer is 3sqrt of 5, this is where I'm confused.

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