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Mean

Mean weight o...

Question

Mean weight of 21 students of a group is 40 kg. If the mean weight of first 10 students is 42 kg and that of last 10 students is 38 kg, then the weight of 11 the student is

A

20 kg

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B

40 kg

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C

30 kg

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D

None of the above

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Solution

The correct option is B 40 kg
Required weight
$= 21 \times 40 - (10 \times 42 + 10 \times 38) = 40$ Kg.

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