Question: A random variable X has a mean p = 12, a variance a2 = 9, and an unknown probability distribution. Using Chebyshev's theorem, estimate (a)

A random variable X has a mean p = 12, a variance a2 = 9, and an unknown probability distribution. Using Chebyshev's theorem, estimate
(a) P(6 < X < 18);
(b) P(3 < X < 21).

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