The mean marks of 25 boys in a class is 61 and the mean marks of 35 girls in the same class is 58 . Then,…
The mean marks of 25 boys in a class is 61 and the mean marks of 35 girls in the same class is 58 . Then, the mean of all 60 students is
56.25
59.25
57.25
63.25
Solution
Number of boys $=25$
Mean marks of boys $=61$
Number of girls $=35$
Mean marks of girls $=58$
Total mean of all 60 students $=\frac{61 \times 25+35 \times 58}{60}$
$
=\frac{1525+2030}{60}=\frac{3555}{60}=59.25
$