请教prep的标准差的问题

9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.5

the mean and the standard deviation of the 8 number shown are 10.0 and 0.3 respectively.

what percent of the 8 number are within 1 standard deviation of the mean?

选项忘了就是几个percent 请帮忙

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2^#

albertes发表于 2007-5-28 13:38 | 只看该作者

 count the number of numbers within the range of 9.7 to 10.3 and express as a percentage of 8.

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3^#

bloomingdales发表于 2007-5-28 21:11 | 只看该作者

ding !!!!

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4^#

happypigfy发表于 2007-5-29 06:38 | 只看该作者

thx,i got.

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