Question

38. The average weight of 10 boys is 35 kg. If a new boy whose weight in 46 kg
joins the group, what will be their average weight?
(a) 37 kg (b) 39 kg (C)38 kg (d) None of these

Answer 1

Answer:

option d. none of these.

Step-by-step explanation:

average of 10 boys= 35*10=350

new boy weight=46 kg

350+46= 396

new average= 396/11= 36

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Answer 2

Option 'd' is correct.

Step-by-step explanation:

Since we have given that

Number of boys = 10

Average weight = 35 kg

So, the sum of weights of boys would be

$\dfrac{\sum x}{10}=35\\\\\sum x=350$

Weight of new boy = 46 kg

So, the new average weight would be

$\dfrac{350+46}{11}\\\\=\dfrac{396}{11}\\\\=36\ kg$

Hence, Option 'd' is correct.

# learn more:

- in a class of 39 students there are 26 girls. the average weight of these girls is 42 kgs and average weight of the full class is 48 kgs. what is the average weight (in kgs) of the boys of the class?

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