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Railways PYQCBT 2 2017

RRB NTPC · Question 71

The mean of first 50 natural numbers is:

  1. 26.5

  2. 25.5

  3. 26

  4. 25

Show answer & explanation

Answer: (B) 25.5

Explanation

The sum of the first 50 natural numbers = 50 × 51/2 = 1275, and 1275/50 = 25.5. (In general the mean is (n + 1)/2.)