SOLUTION: If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
Algebra ->
Probability-and-statistics
-> SOLUTION: If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
Log On
Question 325498: If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
----
Binomial Problem with n = 20 and p = 1/4
----
P(x=4) = 20C4(1/4)^4(3/4)^16 = 0.1897
===============================
Cheers,
Stan H.
(