一道数学题

bighaha

看不见图无法详尽解答。

题干意思：12个元素的数列，告诉平均值，标准差。求元素偏移量满足条件的个数？

[此贴子已经被作者于2009-5-31 0:14:39编辑过]

bighaha

以下是引用xp635在2009-5-31 0:51:00的发言：

1.5 standard deviation =1.5*0.3=0.45

mean=8.1, range under 1.5 standard deviation(7.65, 8.55)

just one number is out of this range, 7.51

so, answer is 11, Am I understood?

YUP, NICE MOVE.