The data shows that as the percentage of wheat in the feed increases (and thus the percentage of corn decreases), the weight gain of the pigs also increases. For example:
- 75% wheat & 25% corn: 40 pounds
- 67% wheat & 33% corn: 47 pounds
- 50% wheat & 50% corn: 51 pounds
- 33% wheat & 67% corn: 54 pounds
- 25% wheat & 75% corn: 61 pounds
From this information, it is clear that:
D. The higher the percentage of wheat in the feed, the greater the weight gain.