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4. Twenty-four percent of executives say that older workers have blocked their career advancement. You randomly...

4. Twenty-four percent of executives say that older workers have blocked their career advancement. You randomly select 12 executives and ask if they feel that older workers have blocked their career advancement. Find the probability that the number why say older workers have blocked their career advancement is (a) exactly three, (b) at least three, and (c) less than four.

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