A psychiatrist believes that 80% of all people who visit doctors have psychosomatic problems. She decides to select 25 patients at random to test he theory. Assuming that her theory is true, find the probability that exactly 15 people who visit doctors have psychosomatic problems.

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Q: LetX∼N(7,4). (a)  Find P(6 < X ≤ 10). (b) Find ξ so that P(6 < X < ξ) = 0.1716.

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