Question
The average mass of a group of 11 pupils is 30 kg and the average mass of another group of 19 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 11 pupils is 30 kg and the average mass of another group of 19 pupils is 36 kg. What is the average mass of the two groups of pupils?