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Railways PYQCBT 1 2016

RRB NTPC · Question 15

The variance of a set of data is 81, find the standard deviation of the data. A. ± 9 B. 9 C. 81 D. 40.5

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

Standard deviation = √variance = √81 = 9 (it is never negative).