[求助]一道标准方差的题.

Henrik · 发表于 2008-4-28 10:13:00

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

anistonlucky · 发表于 2008-4-28 10:59:00

58=M-2D

98=M+3D

laipiyu · 发表于 2008-4-28 11:28:00

同意anistonlucky

Henrik · 发表于 2008-4-28 12:31:00

谢谢了.

gelan1234 · 发表于 2008-4-28 15:40:00

非常感谢，我一直不知道这个几个standard deviations是什么意思...

[求助]一道标准方差的题.

[求助]一道标准方差的题.

所属分类: GMAT考试

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