A student studying for a vocabulary test knows the meanings of 10 words from a list of 26 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the words on the test are words that the student knows? (Round your answer to three decimal places.) Solution [8 known-2 unknown + 9 known-1 unknown + 10 known-0 unknown] / [any 10] [16C8*10C2 + 16C9*10C1 + 16C10*10C0 ] / 26C10 = 0.132.