SOLUTION: the mean weight of 7 people is 61kg. another person joins the group and the mean falls to 59kg. what is the weight of the 8th person

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Question 896350: the mean weight of 7 people is 61kg. another person joins the group and the mean falls to 59kg. what is the weight of the 8th person
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
Mean = sum/#.


For the seven people: 61 = sum/7


sum = 61*7 = 427


For the eight people: 59 = sum/8 so sum = 59*8 = 472


The difference is the weight of the 8th person: 472 - 427 = 45 kg