Refer to Problem, and fill in the following blanks. Approximately

Refer to Problem, and fill in the following blanks. Approximately ,a. 68.26% of students who took the verbal portion of the GRE scored between and______. ,b. 95.44% of students who took the verbal portion of the GRE scored between and______. ,c. 99.74% of students who took the verbal portion of the GRE scored between and______.