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? Round your answer to the nearest whole number.

Answer 1

A calculator with statistics functions would solve this in just seconds. But we should know how to do the problem manually as well.

We need to calculate the area under a standard normal curve with mean 310 and std. dev. of 12, between the scores 286 and 322. z-scores would be helpful here. Any idea of how to proceed?

Answer 2

No

Answer 3

what I am so confused