NDA 2017 Maths · Mathematics · Statistics · medium

The median of the observations 12, 5, 8, 20, 15, 9 is

Single correct option

The median of the observations

12,\ 5,\ 8,\ 20,\ 15,\ 9

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Answer: (A) $10.5$

Arranged in order:

5,8,9,12,15,20

. With six observations the median is the mean of the 3rd and 4th:

\frac{9+12}{2}=10.5

. The value

11.5

is the mean, and

14

comes from averaging the 3rd and 4th terms of the unsorted list.

Original question written in the NDA 2017 Maths pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake