Class Actual Middle Frequency Percentage Cumulative Percentage Limits Point (K) frequency frequency of KK Value (KK) (X) 18-23 17.5-23.5 20.50 10 20% 10 2.79% 24-29 23.5-29.5 26.50 7 14% 17 4.75% 30-35 29.5-35.5 32.50 9 18% 26 7.26% 36-41 35.5-41.5 38.50 5 10% 31 8.66% 42-47 41.5-47.5 44.50 8 16% 39 10.89% 48-53 47.5-53.5 50.50 4 8% 43 12.01% 54-59 53.5-59.5 56.50 2 4% 45 12.57% 60-65 59.5-65.5 62.50 3 6% 48 13.41% 66-71 65.5-71.5 68.50 2% 49 13.69% 72-77 71.5-77.5 74.50 2% 50 13.97%