If a set of standardized test scores is normally distributed,having a mean of 50 and a standard deviation of 10,approximately 68 percent of the group members receive scores somewhere between
A) 50 and 60.
B) 45 and 55.
C) 40 and 60.
D) 35 and 65.

Question

Quizplus · Accepted Answer

The 68/95/99.7 rule for a normal distribution states that approximately 68% of the data falls within one standard deviation of the mean. Given a mean of 50 and a standard deviation of 10, one standard deviation above and below the mean would be 40 and 60, respectively.

If a Set of Standardized Test Scores Is Normally Distributed,having