SOLUTION: A math test has 10 T/F questions. What is the probability that you get at least 8 correct by randomly guessing? This is what i got but im not sure if it is right. 1x.5^8= .003906

Question 295124: A math test has 10 T/F questions. What is the probability that you get at least 8 correct by randomly guessing?
This is what i got but im not sure if it is right.
1x.5^8= .003906
i multiply 1 by .5 and make it to 8th power because each question have 50, 50 change and there are 8 that have to be T.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
t=.5, f=.5
expand(t+f)^10
=t^10+10t^9f+45t^8f^2+... we are interested in this last one and we don't have to go further.
45*.5^8*.5^2
=.043945
.
Ed
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