Mathematics, 21.05.2020 15:57, yairreyes01

There are 10 people in a lift. These 10 people have a mean weight of 79.2kg. 3 of these people get out of the lift. These 3 people have a mean weight of 68kg. Work our the mean weight of the 7 people left in the lift

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There are 10 people in a lift. These 10 people have a mean weight of 79.2kg. 3 of these people get o...