The following frequency distribution shows the distance (in metres) thrown by 68 students in a Javelin throw competition.
| Distance (in m) | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| Number of students | 4 | 5 | 13 | 20 | 14 | 8 | 4 |
Draw a less than type Ogive for the given data and find the median distance thrown using this curve.
