At a factory, the probability that a pair of sunglasses will have a scratch on the lens is 0.03. A manager randomly selects a pair of sunglasses to inspect at irregular intervals. What is the probability that a manager will encounter a scratched pair of sunglasses on the fourth inspected pair of the day? 0.274
0.120
0.885
0.312

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