In October 1981 the mean and the standard deviation on the Graduate Record Exam (GRE) for all people taking the exam were 489 and 126, respectively. What percentage of students would you expect to...

In October 1981 the mean and the standard deviation on the Graduate Record Exam (GRE) for all people taking the exam were 489 and 126, respectively. What percentage of students would you expect to have a score of 600 or less? (This is called the percentile rank of 600.)

For all seniors and non-enrolled college graduates taking the GRE in October 1981, the mean and the standard deviation were 507 and 118, respectively. How does this change the answers to Exercises 3.13 and 3.14?