- #1

- 2

- 0

where L = lower limit of median class

n = no. of observations

cf = cumulative frequency of class preceding the median class,

f = frequency of median class,

h = class size (assuming class size to be equal).

I used to use this formula for grouped data of fix width like

**marks ... no. of student**

0 - 10 ... 5

10 - 20 ... 3

20 - 30 ... 4 and so on.

here grouped data is of fixed width 10=10-0=20-10=30-10 ans so on

BUT how will I

__calculate median if width is not fixed__like

**population ... no. of town**

5 - 10 .... 500

10 - 20 .... 100

20 - 50 ..... 50

50 - 100 .... 30

100 - 200 .... 20

200 - 500 ... 10

500 - 1000 ..... 3

1000 and above .... 2

how will I calculate median in this case