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? Round your answer to the nearest whole number.
+37099 Here is a chart you will just have to memorize (below)
From 310 to 286 is TWO STANDATD DEVIATIONS down and 322 is ONE STANDARD DEVIATION above the mean....
As you can see this covers 13.6% + 34.1% + 34.1 % = 81.8 % of the scores.
