MCQOPTIONS
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| 1. |
Which one of the following is good estimate of person-years lived in a given year ? |
| A. | Population at the begining of the year |
| B. | Population at the middle of the year |
| C. | Population at the end of third quarter of the year |
| D. | Population of the end of the year |
| Answer» C. Population at the end of third quarter of the year | |