The demand for a product of Carolina Industries varies greatly from month to month. Based on the past three years of data, the following shows the monthly demand at Carolina Industries.   Unit Demand # Months 300 6 400 8 500 12 600 10   If the company places monthly orders equal to the expected value of the monthly demand, what should Carolina’s monthly order quantity be for this product? What are the variance and the standard deviation for the number of units demanded?

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