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Railways PYQCBT 1 2016

RRB NTPC · Question 53

The average weight of 25 bags is 55 kg. the weight of one bag was misread as 65 instead of 56. Find the correct mean value. A. 55.25 B. 55.36 C. 54.64 D. 55.65

  1. A

  2. C

  3. B

  4. D

Show answer & explanation

Answer: (B) C

Explanation

Original total = 25 × 55 = 1,375. One bag was read as 65 instead of 56, adding 9 too many, so the correct total = 1,366. Correct mean = 1366/25 = 54.64.