Multiple choice

If the average marks of three batches of $55, 60$ and $45$ students respectively is $50, 55, 60$, then the average marks of all the students is:

  1. $53.33$
  2. $54.68$
  3. $55$

  4. None of these
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B Correct answer
AI explanation

The total marks for the first batch are 55 times 50, which equals 2750. The total marks for the second and third batches are 60 times 55 and 45 times 60, which equal 3300 and 2700 respectively. The combined sum of marks for all 160 students is 8750, so dividing this total by 160 yields an overall average of 54.68.

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