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 WJEC GCSE Maths Averages with exam-style questions for Foundation and Higher tier. 48 questions, matched to the WJEC GCSE Maths (3320QD) specification and written in Unit 1, Unit 2 and Unit 3 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.