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The quality controller in a given firm had an accurate record of all the iron bars produced in May 1997. The following data shows those records Bar lengths (cm) No. of bars(f) for grouped data for ungrouped data, and For ungrouped data, and, For grouped data (201 – 250) 25, (251 – 300( 36, (301 – 350) 49, (351 – 400) 80, (401 – 450) 51, Calculate the standard deviation of the lengths of the bars