Question

______ of the data in a normal distribution lies within 2 standard deviations of the mean.

a 68%

b 99.7%

c 99.50%

d 95%

Explanation:

The empirical rule (or 68 - 95 - 99.7 rule) for normal distributions states that approximately 68% of data lies within 1 standard deviation of the mean, about 95% within 2 standard deviations, and around 99.7% within 3 standard deviations. So for 2 standard deviations, the percentage is 95%.

Answer:

d. 95%