In a normal distribution plus and minus 2 standard deviation

In a normal distribution, plus and minus 2 standard deviations from the mean will include   about what percent of the observations?

A) 50%      E) 34%

B) 99.7%   F) 13.5%

C) 95%     G) 47%

D) 68%     H) 61%

Solution

In a normal distribution, plus and minus 2 standard deviations from the mean will include   about what percent of the observations?

A) 50%      E) 34%

B) 99.7%   F) 13.5%

C) 95%     G) 47%

D) 68%     H) 61%

Answer C) 95%

About 95% of the observations will fall plus and minus 2 standard deviations from the mean in

normal distribution.