Grades for test 1 number of students 1111 864208642 □ number 29394959697989100Grades for test 1 number of students 0 2 4 6 8 10 12 14 16 18 20 0 - 9 10 19 20 29 30 - 39 40 - 49 50 - 59 60 - 69 70 - 79 80 - 89 90 - 100 number