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The following table gives daily wages of workers in a certain commercial organization. The mean of this frequency distribution is ₹ 220, then find the missing frequency ‘f’ of this distribution.

Daily wages (In Rupees) 100-150 150-200 200-250 250-300 300-350
Number of workers 31 58 60 f 27

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xi = 220 (given)

⇒ 220 f- 275 f = 36300 – 38720 

⇒ -55 f = -2420 

⇒ f = \(\frac{2420}{55}\) = 44

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