Answer :

the total number of workers = 90

⇒ median is the mean of 45^{th} and 46^{th} worker’s Income tax

both lies in the range of 4000-5000

let’s assume an equal distribution

33^{rd} worker → 4000

34^{th} worker → 4000 +

45^{th} worker → 4000 + =

45^{th} worker → 4000 + =

median =

⇒ median =

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