Q. 53.9( 18 Votes )

# Rahamatchacha wil

Answer :

Arithmetic mean of grouped frequency distribution is found by taking out midpoints of the class intervals.

Let’s create a table showing frequencies and f_{i}x_{i}.

So, we have

∑f_{i}x_{i} = 2736

∑f_{i} = 50

Using the direct method, we have the formula for arithmetic mean.

Using the above values, we get

⇒ Mean = 54.72

**Thus, mean is 54.72.**

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