Question
Draw a 'less than' ogive for the following frequency distribution:
| Classes: | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
| Frequency: | 7 | 14 | 13 | 12 | 20 | 11 | 15 | 8 |