Asked by shyanne
You guess on all of the answers on a 10 question quiz. If there are 4 possible answers for each question, what is the probability that you get 3 questions right?
i've tried doing this problem multiple times and i'm just not understanding.. step by step would be very helpful.
i've tried doing this problem multiple times and i'm just not understanding.. step by step would be very helpful.
Answers
Answered by
Reiny
prob of getting it right = 1/4
prob of getting it wrong = 3/4
prob of getting 3 of 10 right
= C(10,3) (1/4)^3 (3/4)^7
= 120(1/64)(2187/16384)
= appr .25
prob of getting it wrong = 3/4
prob of getting 3 of 10 right
= C(10,3) (1/4)^3 (3/4)^7
= 120(1/64)(2187/16384)
= appr .25
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