Question: The grades in a large statistics Class have a Normal distribution with mean 64 and variance 121. If a random sample of 4 students were

The grades in a large statistics Class have a Normal distribution

The grades in a large statistics Class have a Normal distribution with mean 64 and variance 121. If a random sample of 4 students were selected from this class, what is the standard deviation of the mean grade of those 4 students

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