Multiple choice

The average marks of 22 students in section A of class 9 are 52, that of 23 students of section B are 50 and that of 25 students of section C are 48. Find the average marks of the students of class 9.

  1. 48.5

  2. 50

  3. 51.91

  4. 49.91

  5. 45.5
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D Correct answer
Explanation

Sum of quantities = average of quantities x number of quantities

So, average marks of class 9 = (22 * 52 + 23 * 50 + 25 * 48)/(22 + 23 + 25)

= 49.91

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