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