Divide 45 by 2.
5 + 15 + 25 + 35 + 45 + 55 + 65 + 75 + 85 + 95 = ___
Class intervals / Frequency
15-25. 6
25-35. 11
35-45 . 7
45-55. 4
55-65. 4
65-75. 2
75-85 . 1