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Cost of raw materials inventory at all operating facilities of a major manufacturing company is under study. A recent audit of raw materials in inventory of all 40 operating facilities within the company (in thousands of tonnes) was conducted. The results of the census are displayed in the character histogram presented below (expenditure gures are in thousands of tons). Histogram of expenditures N = 40 Midpoint Count 150' 3 H" 250 8 Illll 350 ll lllll****** 450 12 Illll 550 6 lllll' Calculate the median. Calculate the standard deviation