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Railways PYQCBT 1 2016

RRB NTPC · Question 5

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13^th observation is

  1. 20

  2. 24

  3. 26

  4. 28

Show answer & explanation

Answer: (D) 28

Explanation

Total of 12 observations = 12 × 15 = 180. Total of 13 observations = 13 × 16 = 208. The 13th observation = 208 − 180 = 28.