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To solve **part v**, we need to calculate the *standardised fertility rate for Mouton*. This involves using the fertility rates and population distributions provided.

### Steps to calculate the *standardised fertility rate for Mouton*:

1. **Standard population distribution**: We have the standard population for three age groups:
   - Age group 0-19: 33%
   - Age group 20-29: 25%
   - Age group 30 and over: 42%

2. **Fertility rates for Mouton**: These are provided for the age groups:
   - Age group 0-19: 12 per thousand
   - Age group 20-29: 60 per thousand
   - Age group 30 and over: `a` (this value is unknown, but we will work with the known data).

3. **Standardised fertility rate** calculation formula:
   \[
   \text{Standardised fertility rate} = \sum \left( \text{Standard population proportion for age group} \times \text{Fertility rate for the same age group} \right)
   \]
   
   Let’s break it down for each age group:
   - Age group 0-19:
     \[
     \frac{33}{100} \times 12 = 3.96
     \]
   - Age group 20-29:
     \[
     \frac{25}{100} \times 60 = 15
     \]
   - Age group 30 and over: (Since we don't know the value of `a`, we can leave this part aside for now.)

4. **Summing up the partial results**:
   \[
   3.96 + 15 = 18.96
   \]

Thus, the **partial standardised fertility rate for Mouton** is **18.96**, but the complete value requires the fertility rate for the 30-and-over age group (`a`), which is missing.

Would you like more details, or clarification on any part of this? 

Here are 5 related questions to deepen your understanding:
1. What is the exact purpose of using a standardised fertility rate?
2. How does the age distribution affect the overall fertility rate of a population?
3. Can you explain how fertility rates influence population growth predictions?
4. What is the difference between crude fertility rate and standardised fertility rate?
5. How would changes in fertility rates in different age groups affect the total population growth?

**Tip:** Standardised fertility rates allow for better comparisons between regions with different age structures.

Learn how to calculate the standardised fertility rate for Mouton using fertility rates and population distributions across age groups. This problem covers concepts such as weighted averages and proportion calculations. Suitable for students in Grades 10-12.

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