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The scores of students on the ACT college entrance examination in 2001 had mean =21.0 and standard deviation = 4.7. The distribution of scores is

The scores of students on the ACT college entrance examination in 2001 had mean =21.0 and standard deviation = 4.7. The distribution of scores is only roughly normal. Now take an SRS of 50 students who took the ACT test. a)

What is the mean and standard deviation of the sample mean score of these 50 students? (Round answer to the nearest ten-thousandth, the fourth decimal place.)

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