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Railways PYQCBT 1 2016

RRB NTPC · Question 25

Variance of data 2, 4, 5, 6, 8, 17 is 23.33. Then the variance of 4, 8, 10, 12, 16, 34 will be: A. 11.66 B. 46.66 C. 93.33 D. 4.93

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (C) C

Explanation

Every value is doubled. Multiplying data by k multiplies the variance by k², so the new variance = 4 × 23.33 = 93.33.