Edexcel GCSE Statistics · 1ST0
Specification 2d.01 · Paper 1, Paper 2
Revise: Index numbersThe Retail Price Index (RPI) and Consumer Price Index (CPI) are weighted measures of changes in consumer prices. They combine prices from many everyday goods and services, rather than tracking just one product. Spending patterns determine the relative importance of categories, and weights can be updated as those patterns change.