wikiHow Calculating Z Score Practice Answers 1. z = (85 - 75) / 10 = 1 2. z = (950 - 1000) / 50 = -1 3. z = (9.1 - 7.5) / 1.2 = 1.33 4. z = (72 - 69) / 2 = 1.5 5. z = (150 - 135) / 15 = 1 6. z = (55 - 45) / 5 = 2 7. z = (60,000 - 50,000) / 10,000 = 1 8. z = (130 - 100) / 15 = 2 9. z = (68 - 64) / 2 = 2 10. z = (19 - 21) / 2 = -1 11. z = (6 - 8) / 1 = -2 12. z = (190 - 170) / 20 = 1 13. z = (72 - 67) / 3 = 1.67 14. z = (85 - 75) / 5 = 2 15. z = (50,000 - 40,000) / 5,000 = 2 16. z = (9.5 - 8) / 1.5 = 1 17. z = (82 - 77) / 3 = 1.67 18. z = (40 - 30) / 5 = 2 19. z = (50 - 70) / 10 = -2 20. z = (72,000 - 60,000) / 8,000 = 1.5 Note that for problems 4 and 13, the heights were converted from feet and inches to inches to use the formula. Page