Question 187761: Everytime Ashley and David play tennis, Ashley has a probability of 4/5 that she wins. if 5 games are played what is the probability that Ashley wins either 4 or 5 of the games? that she wins 3 games?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Everytime Ashley and David play tennis, Ashley has a probability of 4/5 that she wins. if 5 games are played what is the probability that Ashley wins either 4 or 5 of the games? that she wins 3 games?
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It's binomial with n = 5, p = 4/5.
P(she wins 4 or 5 games) = 1 - binomcdf(5,0.8,3) = 0.7373..
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P(she wins 3 games) = 5C3(4/5)^3(1/5)^2 = 0.2048..
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Cheers,
Stan H.
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