The frequency distribution table of expenditures of tiffin allowances of 40 students is given below.

Let us find the median of tiffin allowance.

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.