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Among adults in the United States, the distribution of albumin levels (albumin is a type of protein) in cerebrospinal fluid is roughly symmetric with mean µ = 29.5 mg/ 100 ml and standard deviation σ = 9.25 mg/ 100 ml. Suppose that you select repeated samples of size 20 from this population and calculate the mean for each sample. If you were to select a large number of random samples of size 20, what would be the mean of the sample means?
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