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Alyssa flips a fair,two-sided coin four times.What is the probability that the coin lands with heads facing up exactly three times?
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Alyssa flips a fair,two-sided coin four times.What is the probability that the coin lands with heads facing up exactly three times?

User Nick Westgate
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1 Answer

3 votes
Fair coin means P(heads) = 1/2 for each flip.
The three flips are independent, so multiplication rule applies.
P(head,head,head)=(1/2)(1/2)(1/2)=1/8
User Badaboum
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