To determine whether the quantities in the data table are in a proportional relationship, we need to check if the ratios of the cost to the pounds of bananas are constant.
Let's calculate the cost per pound for each row:
- For 2 pounds: \( \frac{2.50}{2} = 1.25 \)
- For 3 pounds: \( \frac{3.75}{3} = 1.25 \)
- For 5 pounds: \( \frac{6.25}{5} = 1.25 \)
- For 7 pounds: \( \frac{8.75}{7} \approx 1.25 \)
Since the cost per pound is the same (1.25) for all the quantities, the quantities in the data table are in a proportional relationship.
Therefore, the answer is 1.