Compute the median for the following data :
Marks No. of students
More than or equal to 70 0
More than or equal to 60 11
More than or equal to 50 23
More than or equal to 40 43
More than or equal to 30 58
More than or equal to 20 72
More than or equal to 10 82
| marks | CF | points |
| more than or equal to 70 | 0 | 70,0 |
| more than or equal to60 | 11 | 60,11 |
| more than or equal to50 | 23 | 50,23 |
| more than or equal to40 | 43 | 40,43 |
| more than or equal to30 | 58 | 30,58 |
| more than or equal to20 | 72 | 20,72 |
| more than or equal to10 | 82 | 10,82 |
N = 82
N/2=82/2=41
mark 41 on y-axis and draw parallel line to x-axis , meeting the curve at a point.
after plotting a perpendicular line to x-axis , the x -coordinate = 40.5
thus, median = 40.5