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A fair coin is flipped 20 times. a.) determine The probability that the coin comes up tails exactly 15 times. b.) find the probability that

A fair coin is flipped 20 times.

a.) determine The probability that the coin comes up tails exactly 15 times.

b.) find the probability that the coin comes up tails at least 15 times. c.) find the mean and standard deviation for the random c variable giving the number of tails in this coin flipping problem

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