Times Spent in Rush-Hour Traffic A sample of 13 drivers shows the time that they spent (in minutes) stopped in rush-hour traffic on a specific snowy day last winter. Round your answers to one decimal place. 72 70 60 61 49 46 48 75 72 78 71 50 51 Part 1 of 3 Find the range. The range is 32 Part 2 of 3 X Find the variance. X The variance is 123.8 Correct Answer: The variance is 138.4. Part 3 of 3 X Find the standard deviation. The standard deviation is 11.124 . 46 48 49 , 50 51 160 61 70 / 71 , 72 12 75 ) 78 range= 78-46- 32 X X- X Width - = 2. 46 43 250 46 ~ 48 -1318 190 49 ~ 51 -1218 (64 52 ~ 54 -11 8 39 124 55~ 51 58 ~ 60 61 18 = 10 1 8 146, 64 61 ~ 63 64 ~ 66 -118 3124 67 ~ 69 0 1 8 D: 64 70 ~ 72 70 8. 2 67. 24 73 ~ 75 71 9 2 84.62 76 ~ 18 72 1012 104.04 72 75 104.04 78 262.44 2 ( X - * ) - - 1486 . 14 1486. 14 = 123 845 = 123.8