Question

-13 points er keyboard failures can be attributed to electrical defects or ects. A repair facility currently has 25 failed keyboards, 10 of which have electrical defects and 15 of which have mechanical defects. (a) How many ways are there to randomly select 6 of these keyboards for a thorough inspection (without regard to order)? ways (b) In how many ways can a sample of 6 keyboards be selected so that exactly two have an electrical defect? ways (c) If a sample of 6 keyboards is randomly selected, what is the probability that at least 5 of these will have a mechanical defect? (Round your answer to four places.) Need Help?

Answer 1