SOLUTION: 3. A test consists of 5 questions, and to pass the test a student has to answer at least 4 questions correctly. Each question has three possible answers, of which only one is cor
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Question 346653: 3. A test consists of 5 questions, and to pass the test a student has to answer at least 4 questions correctly. Each question has three possible answers, of which only one is correct. If a student guesses on each question, what is the probability that the student will pass the test?
Answer by jrfrunner(365) (Show Source): You can put this solution on YOUR website!
given
n=5, p=1/3 (prob of guessing correctly at a question)
--
let x=number of questions answered correctly
passing means x>=4 this is a binomial dist problem
==
P(x>=4)=P(x=4)+P(x=5)=
==11/3^5=0.045
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