In 2010 almost 15 million U.S. workers belonged to trade unions, constituting 11.9% of the total labor

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In 2010 almost 15 million U.S. workers belonged to trade unions, constituting 11.9% of the total labor force. Choose 15 U.S. workers at random. What is the probability that exactly one-third of them belong to a trade union? At least one-third? What is the probability that at least 9 did not belong?

For Exercises assume all variables are binomial.

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