Let X denote the R.V. that equals the number of tails minus the number of heads when N fair coins are flipped. A. What is the expected value of X?

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Let X denote the R.V. that equals the number of tails minus the number of heads when N fair coins are flipped. A. What is the expected value of X?

Let X denote the R.V. that equals the number of tails minus the number of heads when N fair coins are flipped. A. What is the expected value of X? B. Prove that the variance of X equals N.

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