Multiple choice

The average of the marks secured by 30 students of Grade A is 50, that of 40 students of Grade B is 30 and that of 45 students of Grade C is 55. What is the combined average of the students of the three grades?

  1. 49.28

  2. 45

  3. 43.26

  4. 1725

  5. 38.33
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is a correct answer.

Solution  = (30*50 + 40*30 + 45*55) / (30+40+45)                  =(1500 + 1200 + 2475) / 115                  =5175/115                  =45

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