Commutative frequency curve is a graph drawn with commutative frequency against the upper limit of class interval. The points are joined by a smooth curve and the curve is joined to the lower limit of the first class interval.
Example:
Draw given (cumulative frequency curve) for the data given below:
Class interval | frequency |
1000 – 1100 | 52 |
1100 – 1200 | 35 |
1200 – 1300 | 25 |
1300 – 1400 | 14 |
1400 – 1500 | 41 |
1500 – 1600 | 33 |
Solution:
Class interval | frequency | Cumulative frequency |
1000 – 1100 | 52 | 52 |
1100 – 1200 | 35 | 87 |
1200 – 1300 | 25 | 112 |
1300 – 1400 | 14 | 126 |
1400 – 1500 | 41 | 167 |
1500 – 1600 | 33 | 200 |