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In a computer tape library there are two racks with 40 tapes per rack.In a given day 30 tapes are in use . What fraction remains in the rack?

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If a card punch operator can process 80 cards in half an hour How many cards can this process in 7hr 30min?	In a normal distribution, approximately what percentage of the cases, to the nearest whole number, falls within 4 standard deviations of the mean: