Question

How is the median calculated in discrete series? Explain it with an example.

Answer 1

Calculation of median in discrete series : 

Determination of median in discrete series.

1. Cumulative frequencies are determined as the first step. 

2. Now, the median’s serial number is found using the following formula : M = Value of \([\frac{N+1} {2}]\) th item Where N = Σf

Example: Find out the median value of the following discrete series.

Item-Value	2	4	6	8	10	12	14
Frequency	5	7	12	18	11	6	4

Solution:

Item-Value	Frequency	Cumulative Frequency
2	5	5
4	7	12
6	12	24
8	18	42
10	11	53
12	6	59
14	4	63

M = Value of \([\frac{N+1}{2}]\) th item

= Value of \([\frac{63+1}{2}]\) th item = value of 32^th item

Item 32^th is included in the cumulative frequency 42. The value under cumulative frequency 42 is 8.

Hence, Median = 8