The mean weight per student in a group of 7 students is 55 kg.The individual weight of 6 of them (in kg) are 52,54,55,53,56 and 54. Find the weight of the seventh student.

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Solution

The correct option is A
61

Mean weight of 7 students =55 kg

$∴$ Total weight of 7 students $= 55 \times 7 k g = 385 k g$

Total weights of 6 students = 52+ 54+ 55+ 53+ 56+ 54=324 kg

$∴$ Weight of 7th student $= 385 - 324 = 61 k g$

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