What percent of the values are within plus or minus one standard deviation in a normal distribution?
A) 20%
B) 48%
C) 50%
D) 68%
E) 95%

Question

Quizplus · Accepted Answer

In a normal distribution, approximately 68% of the values are within plus or minus one standard deviation from the mean. This is known as the 68-95-99.7 rule, where approximately 68% of the values fall within one standard deviation, 95% fall within two standard deviations, and 99.7% fall within three standard deviations. Therefore, the best choice is (D) 68%.

What Percent of the Values Are Within Plus or Minus