Which of the Following Is Not a Good Rule of Thumb

question 13

Multiple Choice

Which of the following is not a good rule of thumb for data values exhibiting a normal distribution?

• A) Approximately 95% of the values lie within two standard deviations of the mean.
• B) Approximately two-thirds of the values lie within one standard deviation of the mean.
• C) Exactly half of the values lie at or above the mean.
• D) Exactly half of the values lie within one standard deviation of the mean.