Q. 10 A
Short answer type
Here, we need to find the median class and modal class.
Let us find median class.
Let us create a table.
Here, total sum of frequency, N = 77
Note in the table that, cf = 42 is just greater than 38.5.
⇒ Median class = 125 – 145
Now, let us find modal class.
For modal class, just check the greatest frequency.
Here, the greatest frequency = 20
⇒ Modal class = 125 – 145
Upper class limit of median class = 145
Lower class limit of modal class = 125
Difference = Upper class limit of median class – Lower class limit of modal class
⇒ Difference = 145 – 125
⇒ Difference = 20
Thus, answer is 20.
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