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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 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

Respuesta :

lucasella

Answer:

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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