Answer:
A
Explanation:
the number below 80 mph is the totals from the rows 5, 6 and 7, that is
5 has 3 entries 4, 6, 6
6 has 4 entries 2, 2, 3, 4
7 has 6 entries 0, 0, 1, 2, 2, 3
that is total = 3 + 4 + 6 = 13
13 drivers travel below 80 miles per hour