Question 294231
A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question
What is the probability of getting exactly 9 correct answers?
---------------
Binomial Problem with n = 20 and p = 1/4
----
P(x=9) = 20C9*(1/4)^9*(3/4)^11 = 0.0271
=================
Cheers,
Stan H.
=================