Question 303902: A.How many different ways are there to answer a true/false test that has four questions?
B. If you were to guess at the four answers for the true/false test, what is the probability of getting all four right?
C. If you were to guess at the four answers for the true/false test, what is the probability of getting at least two right?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A.How many different ways are there to answer a true/false test that has four questions?
Ans: 2^4 = 16
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B. If you were to guess at the four answers for the true/false test, what is the probability of getting all four right?
Ans: (1/2)^4 = 1/16
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C. If you were to guess at the four answers for the true/false test, what is the probability of getting at least two right?
Binomial Problem with n=4 ; p = 1/2
P(2<= x <=4) = 1 - binomcdf(4,1/2,1) = 0.6875
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Cheers,
Stan H.
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