Question 1001092: Assume that random guesses are made on a 5 multiple choice ACT test, so there is n=5 trials, with the probability of correct given by p=0.20 use binomial probability
Find the probability that the number of x correct is ATLEAST 3.
Please help im very confused as to how to solve this problem when they are asking for atleast 3
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Assume that random guesses are made on a 5 multiple choice ACT test, so there is n=5 trials, with the probability of correct given by p=0.20 use binomial probability
Find the probability that the number of x correct is ATLEAST 3.
Please help im very confused as to how to solve this problem when they are asking for atleast 3
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Binomial Problem with n = 5 and P(correct) = 0.2
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P(3<= x <=5) = 1 - P(0<= x <=2)
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= 1 - [P(x=0)+P(x=1)+P(x=2)]
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= 1 - binomcdf(5,0.2,2)
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= 0.05792
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Cheers,
Stan H.
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