A mass production line manufactures products of which 10% are faulty. A quality assurance (QA) expert samples products from the production line until he finds a defective product. a. What is the variable under study? (1.5) b. What is the probability that the QA expert sampled at least two products until he got the first defective product? (3) c. Find out the average number of sampled products to get the first defective product. (1.5) d. Also find out the standard deviation of the sampled products to get the first defective product. (1.5)

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0

In a right triangle δabc, the length of leg ac = 5 ft and the hypotenuse ab = 13 ft. find: b the length of the angle bisector of angle ∠a.

Round each of the decimals to the nearest hundredth a. 0.596 b. 4.245 c. 53.6843 d. 17.999