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- UID
- 223272
- 帖子
- 261
- 主题
- 130
- 注册时间
- 2011-7-11
- 最后登录
- 2013-8-22
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Damil4real, I think we are expected to know that:
+/- 1 std dev = 68%
+/- 2 std dev = 95%
+/- 3 std dev = 99%
Of course, like Conquistador07 said, you can always look it up, but that would cost you time. So, it's in your best interest to know those 3 facts by heart. |
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发表于 2011-7-11 18:42
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