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- May 3rd 2008, 03:46 AM #1

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## help me,please...

1. A student studying for a vocabulary test knows the meanings of 12 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 words on the test are words that tha student knows?

Exams

2. A biology quiz consist of 8 multiple-choice questions. 5 must be answered correctly to recieve a passing grade. If each questions has 5 possible answers, of which one is correct.What is the probability that a student who guesses at random on each

- May 3rd 2008, 03:49 AM #2
Please do not double post. Double posting goes against the rules of the forum.

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- May 3rd 2008, 04:01 AM #3

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[quote=aura000;139915]I need help with probability .

P.S. Thank you very much

1. A student studying for a vocabulary test knows the meanings of 12 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 words on the test are words that tha student knows?

Exams

2. A biology quiz consist of 8 multiple-choice questions. 5 must be answered correctly to recieve a passing grade. If each questions has 5 possible answers, of which one is correct.What is the probability that a student who guesses at random on each question will pass the examination?