2010
Mathematics
JAMB
If three unbiased coins are tossed, find the probability that they are all heads
A.
1/2
B.
1/3
C.
1/9
D.
1/8
Correct Answer: 1/8
Explanation
P(H) = 1/2 and P(T) = 1/2 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 = (1/2)3 = 1/8
P(H) = 1/2 and P(T) = 1/2 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 = (1/2)3 = 1/8THIS WEEK's
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