If three unbiased coins are tossed, find the probability ...
If three unbiased coins are tossed, find the probability that they are all heads
12
13
19
18
Correct answer is D
P(H) = 12 and P(T) = 12
Using the binomial prob. distribution,
(H + T)3 = H3 + 3H2T1 + 3HT2 + T3
Hence the probability that three heads show in a toss of the three coins is H3
= (12)3
= 18
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