Question

In a class of $100$ students, the mean marks obtained in a subject is $30$ and in another class of $50$ students, the mean marks obtained in the same subject is $60$. What is the mean marks obtained by the students of two classes taken together?

• A. $40$
• B. $45$
• C. $48$
• D. $50$

Answer 1

The correct option is A $40$

Mean of $100$ students $=30$

Mean of $50$ students $=60$

Mean of $150$ students $=\frac{100\ast 30+50\ast 60}{150}=\frac{3000+3000}{150}=\frac{6000}{150}=40$

Hence, mean marks obtained is $40.$