Julia has a part-time job at an ice skating rink selling hot cocoa. She decided to plot the number of hot cocoas she sold relative to the day's high temperature and then draw the line of best fit. What does the point $(21,65)$ represent?

Step 1 ：The point $(21,65)$ on the graph represents a day when the high temperature was 21 degrees and Julia sold 65 hot cocoas. The x-coordinate represents the high temperature of the day and the y-coordinate represents the number of hot cocoas sold.

Step 2 ：Final Answer: \(\boxed{\text{The point }(21,65)\text{ represents a day when the high temperature was 21 degrees and Julia sold 65 hot cocoas.}}\)