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

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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 5 of these keyboards for a thorough inspection without regard to order ways b In how many ways can a sample of 5 keyboards be selected so that exactly two have an electrical defect ways c If a sample of 5 keyboards is randomly selected what the probability that at least 4 of these will have a mechanical defect Round your answer to four decimal places

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