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Railways PYQCBT 1 2016

RRB NTPC · Question 91

The mean deviation of the data 2, 9, 9, 3, 6, 9, 4 from the mean is: A. 42/7 B. 18/7 C. 2.5 D. 50/7

  1. B

  2. D

  3. C

  4. A

Show answer & explanation

Answer: (A) B

Explanation

Mean = (2 + 9 + 9 + 3 + 6 + 9 + 4)/7 = 42/7 = 6. Absolute deviations: 4, 3, 3, 3, 0, 3, 2, which add to 18. Mean deviation = 18/7.