Q. 2

# Find the mean wage of 200 workers of a factory where wages are classified as follows :

Answer :

This is grouped frequency distribution.

We shall represent them by creating a table having columns of class intervals, midpoints, frequencies, and product of these midpoints and frequencies.

So now, we have

∑f_{i} = 200 and ∑x_{i}f_{i} = 64300

For grouped frequency distribution, mean is taken out from the formula:

⇒ [from the table]

⇒

⇒ Mean = 321.5

**Thus, mean is 321.5.**

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