For a normal distribution
A) all of the data points lie within one standard deviation from the mean.
B) about 2/3 of the distribution lies within one standard deviation from the mean.
C) about 95% of the distribution lies within two standard deviations from the mean.
D) both b and c

Question

Quizplus · Accepted Answer

Option A is incorrect as not all of the data points lie within one standard deviation from the mean in a normal distribution.
Option B is correct as about 2/3 of the distribution lies within one standard deviation from the mean in a normal distribution.
Option C is also correct as about 95% of the distribution lies within two standard deviations from the mean in a normal distribution. Therefore, both options B and C are correct, making option D the best choice.

For a Normal Distribution