Hi

For the normal distribution: 

one  standard deviation from the mean accounts for about 68% of the set 

two standard deviations from the mean account for about 95%

and three standard deviations from the mean account for about 99.7%.

mean of a normal probability distribution is 716; the standard deviation is 11.

 (a) About 68% of the observations lie between what two values? 705 and 727

 (b) About 95% of the observations lie between what two values? 694  and 738

 (c) Practically all of the observations lie between what two values? 683 and 749



 

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