The total cars sold are ________. 

The correct answer is: 28

This line plot to show how many cars sold on each day of the week .
The total number of check marks in the plot is 4+3+5+2+6+5+3 = 28
Therefore, The Total number of cars sold is 28 .

A Line plot can be defined as a graph that displays data as points or check marks above a number line, showing the frequency of each value.
Ex :-Here, for instance, the line plot shows the number of ribbons of each length.