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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

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 of961eighth-graders from a large population in which the scores have mean=281and standard deviation=123.The meanxwill vary if you take repeated samples.

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

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