29. The ratio of the number of girls to the number of boys in a hall was 2:3. After 10 girls and 10 boys entered the hall, the ratio of the number of girls
to the number of boys became 5:7. How many boys were there in the hall
at first?
22

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