Posted by **nneamaka** on Monday, September 23, 2013 at 9:19pm.

air 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 variable X giving the number

of tails in this coin flipping problem.

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