To determine the unit rate for 1 bag of chips, we need to find out how much one bag costs based on the given information.
Given that 5 bags cost $6.25, we can calculate the cost of one bag by dividing the total cost by the number of bags:
\[ \text{Cost of 1 bag} = \frac{\text{Total Cost}}{\text{Number of Bags}} = \frac{6.25}{5} \]
Calculating that:
\[ \frac{6.25}{5} = 1.25 \]
Therefore, the cost of one bag of chips is $1.25.
So, the correct response is:
$1.25