Analytical GRE Scores. The Graduate Record Examination

(GRE) is a standardized test that students usually take before entering graduate school. According to the document GRE Listening, Learning, Leading, a publication of the Educational Testing Service, the scores on the analytical portion of the GRE have mean 3.56 points and standard deviation 0.86 points. Assuming that these scores are

(approximately) normally distributed,

a. obtain and interpret the quartiles.

b. find and interpret the 99th percentile.