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Calculate the range of the following data.
 
Income \(400 - 450\) \(450 - 500\) \(500 - 550\) \(550 - 600\) \(600 - 650\)
Number of workers \(8\) \(12\) \(30\) \(21\) \(6\)
 
Answer:
 
Range \(=\)