求教一Prep题

truekun · 发表于 2011-2-14 19:12:20

70,75,80,85,90,105,130,130,130

The list shown consists of the times, in seconds, that it took each of 10 schoolchildren to run a distance of 400 meters. If the standard deviation of the 10 running times is 22.4 seconds, rounded to the nearest tenth of a second, how many of the 10 running times are more than 1 standard deviation below the mean of the 10 running times?

1: one
2: two
3: three
4: four
5: five

答案是第二个。

马上就考试了

truekun · 发表于 2011-2-14 19:23:26

帮帮忙，祝大家情人节快乐

求教一Prep题

所属分类: GMAT考试

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