There are $60$ students out of which $25$ are girls. The average weight of girls is $40 K g$ and that of boys is $53 K g$ . Mean weight of the entire class?

44.285

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47.54

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47.583

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49.695

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Solution

The correct option is C $47.583$
$u_{g} = 40$ , $u_{b} = 53$
$n_{g} = 25$ , $n_{b} = 35$
$u = \frac{u_{g} \times n_{g} + u_{b} \times n_{b}}{n_{g} + n_{b}}$
$∴ u = \frac{25 \times 40 + 35 \times 53}{25 + 35}$
$∴ u = \frac{2855}{60} = 47.583$
Ans-Option C.

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There are 60 students out of which 25 are girls. The average weight of girls is 40Kg and that of boys is 53Kg. Mean weight of the entire class?

The correct option is C 47.583ug=40, ub=53ng=25, nb=35u=ug×ng+ub×nbng+nb∴u=25×40+35×5325+35∴u=285560=47.583Ans-Option C.

There are $60$ students out of which $25$ are girls. The average weight of girls is $40 K g$ and that of boys is $53 K g$ . Mean weight of the entire class?

The correct option is C $47.583$
$u_{g} = 40$ , $u_{b} = 53$
$n_{g} = 25$ , $n_{b} = 35$
$u = \frac{u_{g} \times n_{g} + u_{b} \times n_{b}}{n_{g} + n_{b}}$
$∴ u = \frac{25 \times 40 + 35 \times 53}{25 + 35}$
$∴ u = \frac{2855}{60} = 47.583$
Ans-Option C.