Question

The GRE is an entrance exam that most students are required to take upon entering graduate school. In 2014, the combined scores for the Verbal and Quantitative sections were approximately normally distributed with a mean of 310 and a standard deviation of 12. What percent of scores were between 286 and 322?

Answer 1

68%

Explanation:

This is the Empirical Rule.

About 68% of all data values lie within 1 standard deviation from the mean.

About 95% of all data values lie within 2 standard deviations from the mean.

About 99.7% of all data values lie with 3 standard deviations from the mean.