In a distribution with a mean of 68 and a standard deviation of 4, 84% of scores fall below a score of approximately
A) 64.
B) 72.
C) 76.
D) 80.

Question

Quizplus · Accepted Answer

Using the empirical rule, we know that approximately 68% of the scores fall within one standard deviation of the mean, and approximately 95% of the scores fall within two standard deviations of the mean. Therefore, if 84% of scores fall below a particular score, we can assume that this score is approximately one standard deviation above the mean. 
So, 
Mean + 1 standard deviation = 68 + 4 = 72. 
Therefore, the answer is B.

In a Distribution with a Mean of 68 and a Standard