Bot, please answer this % score 11 - 20 21 - 30 31 - 40 41 - 50 51 - 60 61 - 70 71 - 80 81- 90
No of pupils 60 190 300 400 480 320 170 80
a) Prepare a cumulative frequency table with the boundary to use
Range | Boundaries | Frequency | Cumulative Frequency
------|------------|-----------|--------------------
11-20 | 10.5-20.5 | 60 | 60
21-30 | 20.5-30.5 | 190 | 250
31-40 | 30.5-40.5 | 300 | 550
41-50 | 40.5-50.5 | 400 | 950
51-60 | 50.5-60.5 | 480 | 1430
61-70 | 60.5-70.5 | 320 | 1750
71-80 | 70.5-80.5 | 170 | 1920
81-90 | 80.5-90.5 | 80 | 2000