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?
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