Question: Scores on the ACT test have a distribution that is approximately normal with mean 21.1 and standard deviation 5.1. A sample of 80 ACT scores

Scores on the ACT test have a distribution that is approximately normal with mean 21.1 and standard deviation 5.1. A sample of 80 ACT scores is randomly selected and the sample mean is computed.
a. Describe the distribution of such sample means.
b. What is the mean of all such sample means?
c. What is the standard deviation of all such sample means?

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