The mean weight of 5 boys is 50 kg. The individual weights of four of them are 40 kg, 43 kg, 50 kg and 65 kg. Find the weight (in kg) of the fifth boy.
52

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Solution

The correct option is A 52
Given,
Mean = 50 kg

$\frac{S u m o f a l l w e i g h t s}{T o t a l n u m b e r o f b o y s} = 50$

Let the weight of fifth boy be x kg.

$\Rightarrow \frac{40 + 43 + 50 + 65 + x}{5} = 50$
$\Rightarrow \frac{198 + x}{5} = 50$

$\Rightarrow x = 250 - 198 = 52$

$∴$ The weight of fifth boy is 52 kg.

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The mean weight of 5 boys is 50 kg. The individual weights of four of them are 40 kg, 43 kg, 50 kg and 65 kg. Find the weight (in kg) of the fifth boy.52

The correct option is A 52Given, Mean = 50 kg Sum of all weightsTotal number of boys=50 Let the weight of fifth boy be x kg. ⇒40+ 43+ 50+ 65+ x5=50 ⇒198+x5=50 ⇒x=250−198=52 ∴ The weight of fifth boy is 52 kg.

The mean weight of 5 boys is 50 kg. The individual weights of four of them are 40 kg, 43 kg, 50 kg and 65 kg. Find the weight (in kg) of the fifth boy.
52