رد: مساعدة في الاحصاء
What's the answer for this question? Why? <<I know the answer but I want to know the reason
When a distribution is bell-shaped, approximately what percentage of data values will fall within 1 standard deviation of the mean ?
A)99.7%
B)95%
C)50%
D)68%
التعديل الأخير تم بواسطة Eng. Abdullah Saeed ; 02-11-2010 الساعة 07:36 PM.
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