In a class of 50 students, 46% are girls and the remaining are boys. The average of the boys’ marks is 58 and that of the girls is 62. What are the average marks of the whole class?
Number of girls = $$50\times\ \frac{46}{100}=23$$
Number of boys = 50 - 23=27
Required average = $$\frac{\left(27\times\ 58+23\times\ 62\right)}{50}=59.84$$
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