ISRO Mechanical & Aerospace 2012 - Question 32

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In a class of 45 students, the mean mark of 25 girls is 32 and the mean mark of 20 boys is 27.5. What is the class mean?

  • A. 32
  • B. 27.5
  • C. 29.75
  • D. 30

Answer: D. 30

Explanation: (25*32 + 20*27.5)/45 = 30.

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