Question

1) what proportion of boys and girls should be selected? 2) How many boys and girls should be selected for a stratified random sample of 30 students? Explain how to obtain this sample question.

Answer 1

Not sure of part I)

Explanation:

Part ii)

To find a stratified sample it is `["each section")/("total")xx("sample size")/1`

Total = boys + girls = 67 + 53 = 120
Sample size is 30

For boys:

`67/120xx30/1=67/4=16 3/4` round up to 17 boys

For girls:

`53/120xx30/1=53/4=13 1/4` round down to 13 girls