Two different age groups were surveyed about the amount of time they spent on social media.
+
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
80+
80+
the survey?
70
70
60
60
250
250
b) How many more 18-year
old students than 12-year
940
740
old students spent
30
.30
20
20
between 25 and 35 mins
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