Multiple choice

The average marks of a class of 30 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?

  1. 50

  2. 52.5

  3. 60

  4. 62.50

  5. 70
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B Correct answer
Explanation

Weighted average = (30 * 40 + 50 * 60) / (30 + 50) = (1200 + 3000) / 80 = 4200 / 80 = 52.5.

AI explanation

The total marks for the first class is 30 students multiplied by 40, giving 1200. The total marks for the second class is 50 students multiplied by 60, giving 3000. The combined total marks for all students is 1200 plus 3000, which equals 4200. The average marks for all 80 students is 4200 divided by 80, resulting in 52.5.

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