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标题: Prep2一题请高人指点 [打印本页]

作者: legationq 时间: 2008-11-27 00:11
标题: Prep2一题请高人指点

9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.2 10.5

The mean and the standard deviation of the 8 number are 10.0 and 0.3. What percent of the 8 numbers are within 1 standard deviation of the mean?

answer choices are 90% 80% 75% 70%

作者: summerice14 时间: 2008-11-27 01:57

75% , 6 numbers is in between(9.7,10.3), but why didn't you offer 9 numbers above

作者: legationq 时间: 2008-11-28 21:28

Thank you very much! Sorry i made a typing mistake.

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