Stratified sampling questions - GCSE maths grade 5, with video examples.

GCSE mathematics stratified sampling questions appear on many exam papers and you can download the questions here. They can be a little challenging and please do practice all of the problems.

The main things to remember when working with GCSE mathematics stratified sampling questions are:

Check that you know the total population size – this is sometimes given, although it’s always good to confirm
A fraction can be read as ‘out of’ so 42/85 means 42 out of 85. This can be helpful when reading through the question.
You might need to round up / down or reduce a sample size in order for the numbers to work out (see question 4)

If you’d like to ask for any more detail, or you’re not sure about anything, please do ask a question in the comments section. I’ll let you know as soon as I’ve posted an answer.

The answer videos are given below. To try to shorten the video length (!), I’ve only answered questions 1, 3 and 6, although here’s the complete worked answers.

All very best with your studies.