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To solve the question regarding the relative frequency of Happy Farm's pigs when compared to the total number of barnyard animals, follow these steps:

### Step 1: Identify the relevant numbers
- Happy Farm has **4 pigs**.
- The total number of barnyard animals (pigs + chickens) is **19** (12 from Happy Farm and 7 from Sunny Farm).

### Step 2: Calculate the relative frequency
Relative frequency is calculated by dividing the number of pigs on Happy Farm by the total number of barnyard animals:

\[
\text{Relative frequency} = \frac{\text{Number of pigs on Happy Farm}}{\text{Total number of barnyard animals}} = \frac{4}{19}
\]

### Step 3: Conclusion
The relative frequency is \(\frac{4}{19}\), so the correct answer is:

\[
\boxed{\frac{4}{19}}
\]

Would you like further details or have any questions?

Here are five related questions:
1. How do you calculate relative frequency for other types of animals, like chickens?
2. What is the relative frequency of pigs across both farms?
3. How do we calculate percentages from relative frequencies?
4. If another farm is added, how would this affect the relative frequency of Happy Farm's pigs?
5. How do we determine if there is an equal distribution of animals between the farms?

**Tip:** Relative frequency is a helpful way to understand proportions in comparison to a total, and it can also be converted into percentages for easier interpretation.

What is the relative frequency of Happy Farm's pigs when compared to the total barnyard animals in town?

Learn how to calculate the relative frequency of pigs from Happy Farm in relation to all barnyard animals in town. This problem covers core math concepts such as relative frequency, ratios, and proportions. Suitable for Grades 5-7.

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