9.4 9.9 9.9 9.9 10 10.2 10.2 10.5 The mean and the standard deviation of the 8numbers shown are 10 and 0.3, respectively. What percent of the 8numbers are within 1standard deviation of the mean? 75%
给出的标准差的条件是什么意思？谢谢作者: Goddezz 时间: 2010-6-29 16:47
我的理解
1 standard deviation of the mean
表示 10-0.3<number<10+0.3
9.7＜9.9 9.9 9.9 10.0 10.2 10.2＜10.3
有六个数在之中9.7和10.3之间, =75%
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