Calculate the mean rainfall for each month, given the following data:

Here are the solutions to the questions:

a) Complete the blank spaces in the table.

First, calculate the mean rainfall ($\bar{X}$).
The sum of rainfall values ($\sum X$) is:

$$\sum X = 0 + 1 + 8 + 19 + 27 + 15 + 9 + 5 + 18 + 36 + 11 + 12 = 161 \text{ cm}$$

The number of months ($n$) is 12.

$$\bar{X} = \frac{\sum X}{n} = \frac{161}{12} \approx 13.42 \text{ cm}$$

Now, complete the