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GCSE maths stratified sampling – grade 5

May 17, 2021 by Simon Deacon Leave a Comment

This video looks at a GCSE maths stratified sampling question and is aimed at around grade 5. The questions are fairly straightforward and, once you get used to the method, should be OK to solve:

Download a copy of the questions here: QT Stratified Sampling

Here’s a copy of the written answers: QT Stratified Sampling ANSWERS

1. The table shows the number of students in each year group at school.

Year group7891011
Number of students220182161170158

Joe is carrying out a survey and uses a stratified sample of 90 students.

Calculate the number of Year 9 students in Joe’s sample.

 

2. In a school 277 students each study one of three subjects.

MathsEnglishScience
Male324927
Female415672

A sample, stratified by language studied and by gender, of 60 of the 277 students is taken.
Calculate the number of female students studying English in the sample.

 

3. At a hospital 746 patients had the same operation. The table shows the age and gender of the patients.

Aged under 18Aged 18 - 65Aged over 65
Male8434250
Female3919437

The hospital wants to take a stratified sample of 80 patients. Complete the table to show how many people from each group should be sampled.

Aged under 18Aged 18 - 65Aged over 65
Male
Female

These types of questions appear in all the main GCSE exam boards – Edexcel, AQA, OCR and Educas.

Top Tips!

  • Make sure you know the totals
  • Try to work methodically and, preferably, down the page
  • You don’t need to reduce the fraction, unless the question asks you to

Here’s a post that also might be of interest:

Stratified Sampling Questions; GCSE maths grade 5

 

Please do leave a comment below if you are not sure. Alternately you can view my YouTube channel and leave a comment there – I’ll always try to respond as quickly as possible.

Watch this video on YouTube:

Quick reminder – Stratified sampling GCSE maths

 

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