Question 419238: A quiz has five multiple-choice questions, each with 4 possible answers. If the quiz is solved by guessing, find the probability that at least one answer is correct Answer by ewatrrr(10682) (Show Source):
A quiz has five multiple-choice questions, each with 4 possible answers.
P(guessing answer correctly) = .25
P(guessing incorrectly) = .75
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=.25and q =.75
P(atleast one correct of the 5 questions) = 1 - P(none correct) = 1 - (.75)^5