prep里面的一道题

cyp7311 · 发表于 2013-8-18 21:31:03

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lilacrabbit · 发表于 2013-8-18 21:46:46

8.1±0.3*1.5 取值范围是（7.65,8.55）只有7.51不在范围内

endless1990 · 发表于 2013-8-18 21:50:40

1.5 standard deviations = 1.5 * 0.3 =0.45
within 1.5 standard deviations of the mean =8.1-0.45~8.1+0.45 thus between 7.65 and 8.55

So only the first one are no within this range

prep里面的一道题

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