If X represents the number of people in Exercise 5.13 who believe that antidepressants do not cure
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If X represents the number of people in Exercise 5.13 who believe that antidepressants do not cure but only cover up the real problem, find the mean and variance of X when 5 people are selected at random and then use Chebyshev's theorem to interpret the interval μ ± 2a.
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