The mean mass of 20 parcels is 25 kg. The mean mass of 8 of these parcels is 19 kg.
Work out the mean mass of the other 12 parcels.
Practise OCR GCSE Maths Averages with exam-style questions for Foundation and Higher tier. 48 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.