CUMULATIVE FREQUENCY

CUMULATIVE FREQUENCY

1. A CUMULATIVE FREQUENCY DIAGRAM IS A WAY OF REPRESENTING CONTINUOUS DATA SO THAT THE MEDIAN, QUARTILES AND INTERQUARTILE RANGE CAN BE FOUND.

2. ALWAYS SHOW HOW YOU FOUND THE THE MEDIAN AND QUARTILES BY DRAWING LINES ON THE GRAPH

3. FIRST YOU NEED TO DRAW A TABLE SHOWING THE DATA YOU HAVE COLLECTED

   • THEN ADD AN EXTRA COLUMN TO THE TABLE AND WORK OUT THE CUMULATIVE FREQUENCY
     • THEN DRAW YOUR GRAPH BY PLOTTING THE CUMULATIVE FREQUENCY AGAINST THE TOP POINT OF EACH GROUP, THEN JOIN THEM WITH A CURVE

4. THE MEAN IS FOUND BY DRAWING A LINE FROM HALFWAY THE CUMULATIVE FREQUENCY AXIS AND READING FROM THE OTHER AXIS