Question
The average mass of a group of 11 pupils is 40 kg and the average mass of another group of 19 pupils is 37 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 11 pupils is 40 kg and the average mass of another group of 19 pupils is 37 kg. What is the average mass of the two groups of pupils?