SOLUTION: Suppose a 10 item multiple choice test which has 5 choices for each questions was given passing grade of 10%. If a student who took the test did not study, what is the probability

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Question 644782: Suppose a 10 item multiple choice test which has 5 choices for each questions was given passing grade of 10%. If a student who took the test did not study, what is the probability that student will pass if he guessed each and every question?



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Answer by colliefan(242) About Me  (Show Source):
You can put this solution on YOUR website!
All the student needs to do to pass is get 10% which means that the student needs to get at least one of the 10 test questions right. The chance of guessing the right answer on one of the questions is 1/5. If the student needed 20% or 2 right questions, the probability would be 1/5 * 1/5, the product of the probability of getting one right question and the probability of getting another question right.