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If random samples, each with n = 9 scores, are selected from a normal population with  = 80 and  = 18, and the mean is calculated for each sample, then the average of all the sample means would be ____.

A random sample of n = 4 scores is obtained from a normal population with  = 20 and  = 4. What is the probability of obtaining a mean greater than M = 22 for this sample?

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