SOLUTION: in a true or false assignment of six questions you are obliged to get at least four correct to pass. If you guess answers to the questions, what are the probabilities that: a) y

Question 1133596: in a true or false assignment of six questions you are obliged to get at least four correct to pass. If you guess answers to the questions, what are the probabilities that:
a) you pass
b) you get at least 50% of the answers correct
c) you get no more than 2 correct
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
binomial expansion for 6
1 6 15 20 15 6 1
0 1 2 3 4 5 6 correct
four or more is 22/64
at least 50% is 42/64
no more than 2 correct is 22/64
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