In 2015, a retail study investigating sustainable packaging practices surveyed 2,000 packaged food products at a national supermarket chain. It found that 1,600 products used non-recyclable plastic packaging, while 400 products used biodegradable or compostable packaging.
In 2025, a replication study with 2,100 packaged food products at the same chain found that 600 products used non-recyclable plastic packaging, while 1,500 products used biodegradable or compostable packaging.
Calculate the ratio of products using non-recyclable plastic packaging to those using biodegradable or compostable packaging in 2025. Give your answer in its simplest form.
Show your workings.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.