SOLUTION: An unbiased coin is tossed four times. Find the probability of the given event. (Round your answer to four decimal places.)
The coin lands heads more than once.
Algebra.Com
Question 679150: An unbiased coin is tossed four times. Find the probability of the given event. (Round your answer to four decimal places.)
The coin lands heads more than once.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The probability of 
successes in 
trials where 
is the probability of success on any given trial is given by:
\ =\ {{n}\choose{k}}\left(p\right)^k\left(1\,-\,p\right)^{n\,-\,k})
Where 
is the number of combinations of things taken at a time and is calculated by !})
But you need the probability of 2 heads PLUS the probability of 3 heads PLUS the probability of 4 heads, so:
\ =\ \sum_{i\,=\,2}^4\,{{4}\choose{i}}\left(0.5\right)^i\left(1\,-\,0.5\right)^{4\,-\,i})
Happy calculating.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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