[virus7]

مامعنى هذه العبارة ؟ وماهو الجواب الصحيح ؟ وكيف جا الحل ؟

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%