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Railways PYQCBT 1 2016

RRB NTPC · Question 50

If the standard deviation of a population is 4.5, what would be the population variance?

  1. 20.25

  2. 20

  3. 9

  4. 18

Show answer & explanation

Answer: (A) 20.25

Explanation

Variance is the square of the standard deviation: 4.5² = 20.25.