prep-PS2-126

xiaoshuyiyi

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

Goddezz

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%