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12.6% of teens in California smoke cigarettes. Suppose that a group of 15 teens were chosen at random. Let X be the number of teens

12.6% of teens in California smoke cigarettes. Suppose that a group of 15 teens were chosen at random. Let X be the number of teens smoke cigarettes, and X has a binomial distribution.

a) Find the probability that exactly 4 of those teens smoke.

b) Find the probability that at least 4 of those teens smoke.

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