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Based upon statistical studies it has been found that 3.35% of all births in the United...

Based upon statistical studies it has been found that 3.35% of all births in the United States will result in twins being born. If 40,000 births are selected at random what is the probability that: a) between 1,300 and 1,400 of them (inclusive) will result in twins being born? b) at least 1,275 of them will result in twins being born?

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