Question 41

The mean score in a test of the 12 boys in a class was 16 while the overall mean of the 30 students in the class was 18.1. What was the mean score of the girls?

Solution

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The correct option is D.

Number of girls = 30-12=18 

let the mean score of girls = $$x$$

then, $$\frac{12\times16+18\times x}{30}$$ = 18.1

$$\implies$$ 192 + 18$$x$$ =543

$$\implies$$ 18$$x$$= 543-192 = 351

                 $$x$$ = 19.5

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