Which of the following statements about probability of occurrence is correct?
A) The range of values found by adding and subtracting one standard deviation to the mean of the random variable accounts for 68.26 percent of the area under the curve.
B) The range of values found by adding and subtracting two standard deviations to the mean of the random variable accounts for 68.26 percent of the area under the curve.
C) The range of values found by adding and subtracting two standard deviations to the mean of the random variable accounts for 99.74 percent of the area under the curve.
D) All of the above are incorrect.

Question

Quizplus · Accepted Answer

The statement in A is correct because it describes the empirical rule, which states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean.

Which of the Following Statements About Probability of Occurrence Is