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The National Assessment of Educational Progress (NAEP) includes a mathematics test

for eighth-graders. Scores on the test range from 0 to 500. Suppose that you give the NAEP test to an SRS of 961eighth-graders from a large population in which the scores have mean μ = 281 and standard deviation σ = 123. The mean x will vary if you take repeated samples. 

The sampling distribution of x is approximately Normal. It has mean μ = 281. What is its standard deviation? round to three decimal places

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x =123/ n... View the full answer

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