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Railways PYQCBT 1 2016

RRB NTPC · Question 53

Find the mean and median of 7, 5, 5, 2, 7, 6, 5, 3, 7, 6 ?

  1. 5.3 and 5

  2. 5 and 6

  3. 5 and 5.5

  4. 5.3 and 5.5

Show answer & explanation

Answer: (D) 5.3 and 5.5

Explanation

The sum is 7 + 5 + 5 + 2 + 7 + 6 + 5 + 3 + 7 + 6 = 53, so the mean = 53/10 = 5.3. Sorted: 2, 3, 5, 5, 5, 6, 6, 7, 7, 7; with 10 values the median is the average of the 5th and 6th, (5 + 6)/2 = 5.5.