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Railways PYQCBT 1 2016

RRB NTPC · Question 8

The standard deviation of the set {10, 10, 10, 10, 10} is

  1. 0

  2. 1

  3. 5

  4. 10

Show answer & explanation

Answer: (A) 0

Explanation

Standard deviation measures how far values spread from the mean. All five values are 10, so the mean is 10 and every deviation is 0. The standard deviation is therefore 0.