The frequency dis

To find median of tiffin allowance, we need to make a table calculating cumulative frequency.

For median:

We have, total frequency, N = 40

N/2 = 40/2 = 20

Observe, cf = 23 is just greater than 20.

Thus, median class = 50 – 55

Median is given by

Where,

L = Lower class limit of median class = 50

N/2 = 20

cf = cumulative frequency of the class preceding median class = 14

f = frequency of the median class = 9

h = class interval of the median class = 5

Substituting these values in the formula of median, we get

⇒

⇒ Median = 50 + 3.33

⇒ Median = 53.33

Thus, the median of tiffin allowance is Rs. 53.33.