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Railways PYQCBT 1 2016

RRB NTPC · Question 46

If the average age of 40 students in class I is 10 years and the average age of 30 students in Class II is 12 years, find the average age (in years) for all students. A. 11 B. 10.54 C. 10.58 D. 10.85

  1. A

  2. B

  3. D

  4. C

Show answer & explanation

Answer: (C) D

Explanation

Total age = 40 × 10 + 30 × 12 = 760 years for 70 students. Average = 760/70 ≈ 10.86, i.e. 10.85 among the options.