anonymous
  • anonymous
A fair coin is tossed 8 times. What is the probability of obtaining exactly 4 heads if it is known that at least 1 head appeared? Round your answer to 4 decimal places
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
If, in the sequence of 8 tossings, that 1 head already appeared and counted as one of the 4? (Just clarifying.)
anonymous
  • anonymous
This is sort of a trick question. Stating that 1 head appeared just means that in the subsequent 7 tosses, what are the odds that you will get 3 more heads?
anonymous
  • anonymous
If thats the case then i would want 3 successes in a number of 7 trials now with the probability of 1/2

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anonymous
  • anonymous
Bayes rulez! (C(7,3)*0.5^7)/(1-0.5^8)...round that urself

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