NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 57

The mean of 25 values was 40. But one value was written as 25 instead of 50. The corrected mean is A. 39 B. 41 C. 40 D. 42

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (B) B

Explanation

Original total = 25 × 40 = 1,000. Correcting 25 to 50 adds 25, giving 1,025. Corrected mean = 1025/25 = 41.