Question
What is the probability that an ordinary year has 53 Sundays?
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| Blood pressure in suitable units. | 110-115 | 115-120 | 120-125 | 125-130 | 130-135 |
| No. of patients | 2 | 35 | 52 | 8 | 3 |
| Class interval | Frequency |
| 10 - 20 | 12 |
| 20 - 30 | 30 |
| 30 -40 | ? |
| 40 - 50 | 65 |
| 50 - 60 | ? |
| 60 - 70 | 25 |
| 70 - 80 | 18 |
| Total | 229 |

| Item | Paper | printing | Binding | advertising | Miscellaneous |
| Expenditure in % | 35% | 20% | 10% | 5% | 30% |