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Railways PYQCBT 1 2016

RRB NTPC · Question 22

What is the mean and mode of the numbers 1, 9, 5, 4, 2, 1, 9, 9, 2, 1, 9, 1, 2, 1? A. 4 and 9 B. 5 and 1 C. 4 and 1 D. 5 and 9

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (C) C

Explanation

There are 14 numbers and their sum is 1 + 9 + 5 + 4 + 2 + 1 + 9 + 9 + 2 + 1 + 9 + 1 + 2 + 1 = 56, so the mean = 56/14 = 4. The value 1 occurs five times, more than any other (9 occurs four times), so the mode = 1.