Mathematics, 08.10.2019 03:30, iiomqjessica
The arithmetic mean (i. e., average) of a set of 7 numbers is 20. the mean of a second set of 13 numbers is 40. what is the mean of all 20 numbers?
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The arithmetic mean (i. e., average) of a set of 7 numbers is 20. the mean of a second set of 13 num...
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