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标题: [求助]一道标准方差的题. [打印本页]

作者: Henrik 时间: 2008-4-28 10:13
标题: [求助]一道标准方差的题.

For a certain examination, a score of 58 was 2 standard deviations below the mean, and a score of 98 was 3 standard deviatioon above the mean. What was the mean score for the deviation.

An: 74.

谢谢

作者: anistonlucky 时间: 2008-4-28 10:59

58=M-2D

98=M+3D

作者: laipiyu 时间: 2008-4-28 11:28
同意anistonlucky

作者: Henrik 时间: 2008-4-28 12:31

谢谢了.

作者: gelan1234 时间: 2008-4-28 15:40
非常感谢，我一直不知道这个几个standard deviations是什么意思...

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