Question: Find the percentile for the observed value in the following situations:
a. GRE score of 450 (mean = 497, s.d. = 115).
b. Stan ford-Binet IQ score of 92 (mean = 100, s.d. = 16).
c. Woman's height of 68 inches (mean = 65 inches, s.d. = 2.5 inches).