From the mid-1960s to the early 1990s, there was a slow but steady decline in SAT scores. For example, take the Verbal SAT. The average in 1967 was about 543; by 1994, the average was down to about 499. However, the SD stayed close to 110. The drop in averages has a large effect on the tails of the distribution. (a) Estimate the percentage of students scoring over 700 in 1967. (b) Estimate the percentage of students scoring over 700 in 1994. Freedman, David. Statistics (Fourth Edition) (p. 94). W. W. Norton