For this, just add up all the points for the trucks.
2+2+3+3+3+4+5= 22
Then divide by the amount of numbers you added to get 22.
22/7 = 3.14
Round this to the nearest tenth by looking at the number beside. If it is higher than 5, then add one to the tenth place, but if it is not keep it the same.
The final answer will be B.
