Question

If the median of the following frequency distribution is 28.5 find the missing frequencies:

Class interval:	0−10	10−20	20−30	30−40	40−50	50−60	Total
Frequency:	5	f1	20	15	f2	5	60

Answer 1

Given: Median = 28.5

We prepare the cumulative frequency table, as given below.

Now, we have

.....(1)

Also,

Since the median = 28.5 so the median class is 20−30.

Here,

We know that

Putting the value of in (1), we get

Hence, the missing frequencies are 7 and 8.