Q. 10 D4.1( 9 Votes )

# If <span la

Answer :

Given that, …(i)

∑fiui = 20

∑fi = 100

From the step deviation method, we have the relation of deviation (ui) and assumed mean (A). Comparing it with equation (i),

A = 25

h = 10

Using the formula of step deviation method, we have  Mean = 25 + 2

Mean = 27

To find modal class, we need to find frequencies of the data given. Note the greatest frequency in the data.

So, greatest frequency = 30

Thus, the corresponding class is 30 – 40.

Modal class = 30 – 40

Thus, mean is 27 and modal class is 30 – 40.

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