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Railways PYQCBT 1 2016

RRB NTPC · Question 92

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

  1. 19

  2. 18

  3. 17

  4. 16

Show answer & explanation

Answer: (A) 19

Explanation

Original total = 10 × 13 = 130, and the new total = 12 × 14 = 168. The two new observations add to 168 − 130 = 38, so their mean is 19.