Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently ha

[answerhappygod]

Computer Keyboard Failures Can Be Attributed To Electrical Defects Or Mechanical Defects A Repair Facility Currently Ha 1 (20.03 KiB) Viewed 74 times

Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which have electrical defects and 19 of which have mechanical defects. (a) How many ways are there to randomly select 7 of these keyboards for a thorough inspection (without regard to order)? 53130 x ways (b) In how many ways can a sample of 7 keyboards be selected so that exactly two have an electrical defect? 14534 X ways (c) If a sample of 7 keyboards is randomly selected, what is the probability that at least 6 of these will have a mechanical defect? (Round your answer to four decimal places.)