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Railways PYQCBT 1 2016

RRB NTPC · Question 19

The variance of a set of data is 196. Then the standard deviation of the data is. A. ± 14 B. 14 C. 96 D. 98

  1. C

  2. D

  3. A

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Standard deviation = √variance = √196 = 14. It is never negative, so ±14 is wrong.