# SOLUTION: a student takes a 20 question, multiple choice exam with five choices for each question. if the student is guessing, find the following probabilities getting every question but two

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: a student takes a 20 question, multiple choice exam with five choices for each question. if the student is guessing, find the following probabilities getting every question but two      Log On

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Probability-and-statistics Question 464846: a student takes a 20 question, multiple choice exam with five choices for each question. if the student is guessing, find the following probabilities getting every question but two wrongAnswer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! ``` Hi, Note: The probability of x successes in n trials is: P = nCx* where p and q are the probabilities of success and failure respectively. In this case p (guessing right) = .20 and q = .80 nCx = |20C2 = 190 P(guessing 18 out of the 20 incorrectly) = 190(.20)^2(.80)^18 =.1369 ```