1. The problem asks to prepare a data sheet suitable for tabulation to record monthly rainfall from 10 rain-gauges in different zones. 2. To structure the raw data, we create a table with columns representing each relevant variable. 3. The columns can be: "Month", "Zone", "Rain-gauge Number", and "Rainfall (mm)". 4. "Month" indicates the month of recording. 5. "Zone" indicates the different geographic zones where rain-gauges are placed. 6. "Rain-gauge Number" identifies each rain-gauge (1 to 10). 7. "Rainfall (mm)" records the rainfall measurement in millimeters. 8. Each row of the table will represent a single reading from one rain-gauge for a particular month. 9. This organization makes it easy to collect, sort, and analyze the rainfall data across zones and months.