The histogram shows information about the
speed of cars as they pass a checkpoint.
The scale on the frequency density axis
is missing.
Speed of cars
Frequency density
15 20
25
30 35
Speed (mph)
40
45
50
The histogram shows information about
480 cars.
a) How many cars does the first bar represent? (4)
b) Cars with a speed greater than 40 mph are
over the speed limit. Use the histogram to
estimate the number of cars that are over
the speed limit.
+
(2)
+
Total marks: 6