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The total marks obtained by a student in Physics, Chemistry and Mathematics is 150 more than the marks obtained by him in Physics. What is the average mark obtained by him in Chemistry and Mathematics?

Correct answer: A. 75

  • A. 75
  • B. 150
  • C. 50
  • D. None of these

Explanation

Let the Physics marks be P, Chemistry marks be C and Mathematics marks be M. Since P + C + M is 150 marks more than P, cancelling P gives C + M = 150 marks; their average is 150 marks / 2 = 75 marks. A student may choose 150 marks by reporting the combined total instead of its average.

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About Averages

An average represents the total of a set of values divided by the number of values, and a weighted average gives different importance to different groups. Problems involve missing values, combined averages, replacement of observations, and changes in the average, so the total and count must be tracked separately.

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