CHAPTER 3

. On Six consecutive days, the maintenance department received 7, 10, 9, 11, 13 and 7 service calls. Calculate s. . Find the variance, given: x = 45?, x2: 15,345, n = 14. . Here are the scores of Miss Universe candidate from 8 judges: 8.95, 8.60, 9.60, 9.10, 9.15, 9.25, 8.85 and 9.30. Find the standard deviation of the scores. . In a statistics class are 20 masscom students, 18 commerce students, and 12 science students. If the masscom students average 68 in the test, the commerce students averaged 75, and science students average 86 find the standard deviation of the scores. |