Principles of statistics

(1) A social psychologist interested in drinking behavior investigates the number of drinks served at bars in a particular city on certain Fridays during happy hour. In the city there are 213 bars. Since there are too many to go through, she chooses 20 and records the number of drinks served in them. The data is as follows; 50 82 47 65 40 76 61 72 35 43 65 76 63 66 83 82 57 72 71 58