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27 July, 07:52

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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  1. 27 July, 10:54
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    84kg

    Step-by-step explanation:

    10*79.2kg=792kg the weight of the 10 people

    3*68kg=204kg the weight of the 3 people who get out of the lift

    792kg-204kg=588kg the weight of the 7 people left in the lift

    so, the mean weight of the 7 people left in the lift=588kg:7=84 kg
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