Question

About what percentage of the area under the normal dis-

tribution curve falls within 1 standard deviation above
and below the mean? 2 standard deviations? 3 standard
deviations?

Answer 1

hope this help !

Explanation:

Under this rule, 68% of the data falls within one standard deviation, 95% percent within two standard deviations, and 99.7% within three standard deviations from the mean.