Question
The average mass of a group of 13 pupils is 33 kg and the average mass of another group of 17 pupils is 36 kg. What is the average mass of the two groups of pupils?
3 m

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The average mass of a group of 13 pupils is 33 kg and the average mass of another group of 17 pupils is 36 kg. What is the average mass of the two groups of pupils?