Draw a combined histogram and frequency polygon for the following distribution:
| Classes | 91-100 | 101-110 | 111-120 | 121-130 | 131-140 | 141-150 | 151-160 |
| Frequency | 16 | 28 | 44 | 20 | 32 | 12 | 4 |
Solution:
The classes in continuous frequency classes:
| Classes | Classes after adjustment | Frequency |
| 91-100 | 90.5-100.5 | 16 |
| 101-110 | 100.5-110.5 | 28 |
| 111-120 | 110.5-120.5 | 44 |
| 121-130 | 120.5-130.5 | 20 |
| 131-140 | 130.5-140.5 | 32 |
| 141-150 | 140.5-150.5 | 12 |
| 151-160 | 150.5-160.5 | 4 |
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