9. The probability a person is infected by a certain cold virus is 0.2. If a random sample of 12 people is taken, what is the probability that at least one person will be infected by the cold virus? * A.0.2062 B.0.9313 C.0.2400 D.0.0687

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