A school has 4 sections of chemistry in Class X having…

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A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.

  1. A. 50.25
  2. B. 51.25
  3. C. 52.25
  4. D. 53.25

Answer: Option C

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Solution(By ExamCraze Team)

Average marks
$$eqalign{ & = left( {frac{{50 times 40 + 60 times 35 + 55 times 45 + 45 times 42}}{{40 + 35 + 45 + 42}}} right) cr & = left( {frac{{2000 + 2100 + 2475 + 1890}}{{162}}} right) cr & = left( {frac{{8465}}{{162}}} right) cr & = 52.25 cr} $$

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