Under 18 29
10
39
18 to 30
82
21
103
31 to 50
45
IN
Over 50
120
Total number of members
454
The club secretary carries out a survey of the members.
He chooses a sample, stratified both by age range and by gender, of 90 of the 454 members
(b)
Work out an estimate of the number of male members, in the age range 31 to 50, he
would have to sample.
WHAT
Total