# statistics

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.

1. 👍
2. 👎
3. 👁
1. 15

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2. 👎

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