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Railways PYQCBT 1 2016

RRB NTPC · Question 60

The mean of 6 observations is 12. Two observations are added to these and the new mean becomes 13. Mean of two new observations: A. 16 B. 18 C. 13 D. 15

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (D) A

Explanation

Sum of 6 observations = 72; sum of 8 = 8 × 13 = 104. The two new observations total 32, so their mean is 16.