Two different age groups were surveyed about the amount of time they spent on social media.
The results are shown in the two frequency
polygons below. The same time intervals were
used for both graphs.
a) How many 15-year old
11-year old students
15-year old students
80+
801
students took part in
70
70
the survey?
(1)
60
250
50
b) How many more 15-year
640
340
old students than 11-year
.30
30
old students spent
20 |
20
between 35 and 45 mins
10
10
on social media?
0
0 10 20 30 40 50 60 70 80
(1)
60
M
0
60 70 80