Given the data points on the Scatter Plot, you know that it represents the weight In pounrs) and fuel efficiency (in miles per gallon) for each of 21 vehicles.
In order to draw the line that best fit a on a Scatter Plot you need to follow these steps:
1. Plot all the data points.
2. Draw a straight line that passes evenly trough the points plotted. The number of points above the line and below the line must be approximately equal.
Knowing the explained above, you can graph the line of best fit on the Scatter Plot.
Hence, the answer is: