Find the variance of 1 - 2X, when the random variable X is the number of...

Question

Question

Find the variance of 1 - 2X, when the random variable X is the number of heads when 3 coins are tossed.

Answer 1

Answer #1

x X is the number of heads when 3 coins are tossed. Then, it will take values 0, 1, 2 and 3. Because head may OCCUT at 3, 2,

Answer 2

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