BTGmoderatorDC wrote:If a coin has an equal probability of landing heads up or tails up each time it is flipped , what is the probability that the coin will land heads up exectly twice in 3 consecutive flips ?
A. 0.125
B. 0.25
C. 0.375
D. 0.5
E. 0.666
P(HHT) = 1/2 * 1/2 * 1/2 = 1/8.
Since T can occur on the 1st, 2nd or 3rd flip, we multiply by 3:
3(1/8) = 3/8 = 0.375
The correct answer is
C.
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