Q. 10 A

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

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