Worksheet 20 Standard Scores and the Normal Curve Riddle: How do many economics professors stay fit? DIRECTIONS: To find the answer to the riddle, write the answer to each question in the space immediately below it. In the solution section, the word in parentheses next to the answer to the first question is the first word in the answer to the riddle, the word beside the answer to the second question is the second word, and so on. 1. To two decimal places, what percentage of the cases in a normal distribution lie above a z-score of -1.00? 2. To two decimal places, what percentage of the cases in a normal distribution lie below a z-score of 1.96? 3. To two decimal places, what percentage of the cases in a normal distribution lie above a z-score of 1.00? 4. To two decimal places, what percentage of the cases in a normal distribution lie below a z-score of 3.00? 5. To two decimal places, what percentage of the cases in a normal distribution lie below a z-score of -2.00? 6. To two decimal places, what percentage of the cases in a normal distribution lie between a z-score of 1.00 and a z-score of -1.00