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Approximately 30% of the time demand of a product is more than 250 units, and 20% of the time demand is less than 200 units.

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Approximately 30% of the time demand of a product is more than 250 units, and 20% of the time demand is less than 200 units. What is the average demand? What is the standard deviation of demand? (Demand can he assumed to foow a normal distribution) [Ans 230.8, 36.23]

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