farmer
(农夫)

a) What is the probability that more than 25 reels are defective?

b) What is the probabilty that between 15 adn 20 reels (inclusive) are defective?

b) What is the probabilty that between 15 adn 20 reels (inclusive) are defective?

(#214328@0)

2001-10-1 -05:00

2001-10-1 -05:00