Use this description for Questions 5-8. Dr. Fink is conducting a study on the safety of food in the local grocery store. He has collected 19 random samples of raw beef, and for each one he has tested it for occurrence of the bacteria Salmonella. 5. The individuals in this study are a. Dr. Fink b. The grocery store c. Meat samples d. Salmonella bacteria 6. To find out how many of the beef samples he collected have tested positive, he needs to calculate a a. Mean b. Count c. Standard deviation d. Conditional probability 7. To estimate how often beef samples in the store are infected, he needs to calculate a a. Mean b. Count c. Proportion d. Conditional probability