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This question will test the ability of test taker to distinguish between solving mean and solving weighted mean problem

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There are two groups of tamed Cheetahs: Group A has 5 cheetahs with mean weight of 35kg, while, group B has 7 cheetahs with mean weight of 45kg. 

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\"Three

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Photo by Tambako the Jaguar  CC BY-ND 2.0

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This is a weighted mean problem. 

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What is the mean weight of all the cheetahs in the two groups put together?

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If the weights of 4 of the cheetahs in group A are 20kg, 30kg, 45kg & 32kg.  What is the weight of the 5th cheetah?

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One of the cheetahs in group B delivered 2 cubs (immediately after her weight was taken). The cubs weigh 11kg & 12kg each. What is the new mean weight of the 7 cheetahs after the delivery (assuming the weight lost equals the weights of the two cubs)?

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