رد: سؤال بآيخ < ‘
18. When a distribution is bell-shaped, approximately what percentage of data values will
fall within 1 standard deviation of the mean?
A) 50% B) 68% C) 95% D) 99.7%
الجواب 68%
شوفو ص 136
فيه ثلاث نسب ( حفظ )
68% > 1
%95 > 2
99.7% > 3
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