 probability? - XP Math - Forums Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment  XP Math - Forums probability? 07-28-2007 #1 delkkis Guest   Posts: n/a probability? multiple choice questions each have five possible answers (a, b,c,d,e), one of which is correct. assume that you guess the answers to three such questions.use the multiplication rule to find the probability that the first two guesses are wrong and the third is correct. That is, find p(wwc), where c denotes a correct answer and w denotes a wrong answer?  07-28-2007 #2 cool_joh Guest   Posts: n/a 4/5 * 4/5 * 1/5 = 16/125  07-28-2007 #3 Mr. me Guest   Posts: n/a The probability of a wrong answer is the number wrong over the total number of possible answers. Since, for each question, only one answer is correct, the probability of a wrong answer is 4/5, and the probability of a correct answer is 1/5Hence p(wwc) = 4/5 * 4/5 * 1/5 = 16/125 (or .128)  07-28-2007 #4 Gopla69 Guest   Posts: n/a Probability is 0.128 Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
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