For the following data find out the approximate mean of wages using step deviation method.

30

rupees

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33

rupees

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31

rupees

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37

rupees

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Solution

The correct option is B $33$ rupees
The formula used for step deviation method is $¯ x = A + \frac{\sum f u'}{\sum f} \times i$
$= 12 + \frac{32}{18} \times 12$
$= 12 + 21.33$
$¯ x = 33.33 \sim 33$ rupees.

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