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An association of coffee producers has estimated that 50% of adult workers drink coffee at least occasionally while on the job. Given this estimate:

a. For a randomly selected group of 4 adult workers, what is the probability that no more than 3 of them drink coffee at least occasionally while on the job?

b. In part (a), what is the probability that at least 2 of these individuals drink coffee at least occasionally while on the job?

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