Question

select the correct answer.
for a normal distribution, what percentage of values lies within two standard deviations of the mean?
○ a. 99.7%
○ b. 97%
○ c. 68%
○ d. 95%

Explanation:

The empirical rule (68 - 95 - 99.7 rule) for a normal distribution states that approximately 68% of the data lies within 1 standard deviation of the mean, about 95% within 2 standard deviations, and roughly 99.7% within 3 standard deviations.

Answer:

D. 95%