Two different age groups were surveyed about the amount of time they spent on social media.
Frequency
The results are shown on the two frequency
polygons below. The same time intervals were
used for both graphs.
a) How many 18-year old
students took part in
12-year old students
18-year old students
the survey? 320
80
801
70
70
60
60
b) How many more 18-year
50
50
old students than 12-year
30
old students spent
between 25 and 35 mins
20
20
on social media?
10
10
0
0
0 10 20 30 40 50 60 70 80 0 10 20 30 40 50 60 70 80
Time (mins)
Time (mins)
Frequency
840
30