The mean marks of 10 boys in a class is 70 whereas the mean marks of 15 girls is 60. The mean marks of all the 25 students is:

64

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60

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55

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52

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None of these

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Solution

The correct option is D $64$
The mean marks of 10 boys = 70
Total marks of 10 boys = $70 \times 10 = 700$
The mean marks of 15 girls = 60
Total marks of 15 girls $= 60 \times 15 = 900$
$∴$ Sum of the total marks of 25 students
$= 700 + 900 = 1600$
$∴$ The mean marks of all the 25 students
$= R s . \frac{1600}{25} = 64$

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The mean marks of 10 boys in a class is 70 whereas the mean marks of 15 girls is 60. The mean marks of all the 25 students is:

The correct option is D 64The mean marks of 10 boys = 70 Total marks of 10 boys = 70×10=700 The mean marks of 15 girls = 60 Total marks of 15 girls =60×15=900 ∴ Sum of the total marks of 25 students =700+900=1600 ∴ The mean marks of all the 25 students =Rs.160025=64