PP数学请教

马尔代夫 · 发表于 2006-7-11 16:47:00

[attachimg]48508[/attachimg]

请问这道题是在要求做什么？谢谢！

kallyli · 发表于 2006-7-11 18:12:00

within one standard deviation means the number should within the scope of

(10-0.3)<=x<=(10+0.3)

so 9.4 and 0.5 are not in it, 6 numbers left

6/8=75%

[此贴子已经被作者于2006-7-11 18:13:22编辑过]

lovetiky · 发表于 2006-7-11 18:13:00

there are 6 numbers in the range from mean-stand deviation to mean+stand deviation

thus the percentile is 6/8=75%

马尔代夫 · 发表于 2006-7-12 11:43:00

多谢楼上两位，很清楚！

所属分类: GMAT考试