A box contains 3 plain pencils and 9 plain pens. A second box contains 7 color pencils and 3 crayons. One item from the box is chosen at random. What is the probability that a plain pencil from the first box and a color pencil from the second box are selected?

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