To find the average price of one lemon in the summer, first identify the average price of a four-count bag of lemons in the summer from the graph.
If the average price of the four-count bag of lemons in summer is, for example, $8 (you would need to check the actual graph), then to find the price of one lemon, you would divide the total bag price by the number of lemons in the bag:
\[ \text{Price per lemon} = \frac{\text{Price of four-count bag}}{4} \]
If the average price of the bag in summer is $8:
\[ \text{Price per lemon} = \frac{8}{4} = 2 \]
Thus, if the average price was $8, the average price of one lemon in the summer would be $2.
Please check the graph for the specific value for the average price in summer to apply this calculation correctly.