The mean weight of a group of seven boys is 56 kg. The individual weights (in…
2024
The mean weight of a group of seven boys is 56 kg. The individual weights (in kg) of six of them are 52, 57, 55, 60, 59 and 55. Find the weight of the seventh boy.
- A.
64
- B.
54
- C.
43
- D.
67
Attempted by 111 students.
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Correct answer: B
Solution:
Total weight of the seven boys = mean × number = 56 × 7 = 392.
Sum of the six given weights = 52 + 57 + 55 + 60 + 59 + 55 = 338.
Weight of the seventh boy = 392 − 338 = 54 kg.
Therefore the seventh boy weighs 54 kg.