SOLUTION: determine the probability of randomly guessing 40 questions correct out of 60 questions on a multiple choice test with possible selections a,b,c,d,e; by guessing

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Question 271712: determine the probability of randomly guessing 40 questions correct out of 60 questions on a multiple choice test with possible selections a,b,c,d,e; by guessing
Answer by solver91311(24713) About Me  (Show Source):
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The probability of exactly successes in trials where the probability of success on any given trial is is given by:



Where is the number of ways to select things from a collection of things and is equal to

Since there are 5 responses to each question, the probability of a random correct response on any given question is .

Just plug in the numbers...




And do the arithmetic.

John