The table shows the number of families staying at a campsite in 2015. Questionnaires are sent to 60 families.
The sample of size 60 is stratified by type of unit and area.
Area
a) How many families who
Woods Fields Clifftop
stayed in a Tent in the
Woods are sent a
Caravan 25
20
35 questionnaire?
Type of unit Tent
15
30
b) How many families who
45
stayed in a Caravan
Motorhome 60
are sent a questionnaire?
50
20
Total
100
100
100