Homework Help: Statistics

Posted by Jacob on Tuesday, June 15, 2010 at 7:10pm.

Richard has been given a 5-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended the class recently, he does not know any of the answers. The success occurs if Richard answers a question correctly and the failure occurs if Richard is unable to answer a question correctly. Assuming that Richard guesses on all five questions, find the probability that he will answer all questions incorrectly. Round your answer to the nearest thousandth.
my answer was 0.500 which was wrong please help
0.237
0.410
0.800
0.750
0.5 0.500

Statistics - PsyDAG, Wednesday, June 16, 2010 at 2:13am
the probability that all events would occur is found by multiplying the probabilities of the individual events.

(3/4)^5 = ?

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