Truck stop

This task is about reading information from a tally chart.
TIME PERIOD NUMBER OF TRUCKS
4:00 p.m. – 4:30 p.m.
4:30 p.m. – 5:00 p.m.
5:00 p.m. – 5:30 p.m.
5:30 p.m. – 6:00 p.m.
6:00 p.m. – 6:30 p.m.
6:30 p.m. – 7:00 p.m.
7:00 p.m. – 7:30 p.m.   
 

The table shows the number of trucks that passed a Police Checkpoint one Friday.

 

a)
How many trucks passed through the checkpoint
 
 
i)
 
ii)
 
iii)
between 4:00 p.m. and 4:30 p.m.? ___________
 
between 5:00 p.m. and 6:00 p.m.? ___________
 
after 6:00 p.m.? ___________
 
b)
During which one-hour period did most trucks pass through the checkpoint?
 
  (A)
(B)
(C)
(D)
(E)
4:00 p.m. – 5:00 p.m.
4:30 p.m. – 5:30 p.m.
5:00 p.m. – 6:00 p.m.
5:30 p.m. – 6:30 p.m.
6:00 p.m. – 7:00 p.m.