The upper class limit for the class (70-80]is:

Classes for exam scores Number of students 90 and over 5 80 - 90 12 70 - 80 40 60 - 70 18 50 - 60 13 40 - 50 6 Under 40 6 C D E G H K L M N Charts from Grouped Data Example from Grouped Data N Frequency Relative Frequency 0.450 0.4000 OU400 0. 300 0.250 0.300 10.1800 13 0.150 0.1300 0.1300 17 5 18 0. 100 0.0600 0.0500 19 0.0500 20 21 Under 40(40, 50] (50, 60] (60, 70] (70. 80] [80, 50] 50 and 0.000 Under 40 (40, 50] (50, 60] [60, 70] [70, 80] [80, 90] 90 and OVER