Average weight of 8 boys is 57 kg ,if weight of seven of them are 64, 42, 29, 39, 80, 52 and 55 kgs, then weight of the eighth student is

75 kg

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65 kg

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55 kg

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35 kg

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Solution

The correct option is D 35 kg
Required weight
$= 57 x 8 - (64 + 42 + 29 + 39 + 80 + 52 + 55)$
$= 456 - 361 = 35 k g$

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Average weight of 8 boys is 57 kg ,if weight of seven of them are 64, 42, 29, 39, 80, 52 and 55 kgs, then weight of the eighth student is

The correct option is D 35 kgRequired weight =57x8−(64+42+29+39+80+52+55)=456−361=35kg

The correct option is D 35 kg
Required weight
$= 57 x 8 - (64 + 42 + 29 + 39 + 80 + 52 + 55)$
$= 456 - 361 = 35 k g$