The mean weight of a group of seven boys is 56 kgs. The individual weights (in kg) of six of them are 52, 57, 55, 60, 59 and 55. Find the weight of the seventh boy. [4 MARKS]

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Solution

Concept: 2 Marks
Application: 2 Marks

Mean weight of 7 boys = 56 kg.

Total weight of 7 boys $= (56 \times 7) k g = 392 k g$

Total weight of 6 boys = (52 + 57 + 55 + 60 + 59 + 55) kg

= 338 kg

Weight of the 7th boy

=(total weight of 7 boys) - (total weight of 6 boys)

=(392 - 338) kg = 54 kg

Hence, the weight of the seventh boy is 54 kg.

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