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20 September, 13:33

If you flip three coins simultaneously, what's the probability you'll get three heads for the first time on the fifth toss?

a. 125

b. 1094

c. 763

d. 0733

e. 5

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Answers (1)
  1. 20 September, 13:42
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    In this question, you are flipping 3 coins simultaneously until you get all 3 heads, so we are looking at a binompdf, where x=5 (landing a success on the 5th trial), and p=0.5^3 (probability of success, meaning the probability of getting three heads). Plugging in to your calculator, binompdf (0.125,5) = 0.0733
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