1 00:00:00,000 --> 00:00:04,364 Sleep time of 15 students, from least to most. 2 00:00:11,750 --> 00:00:13,810 What is the range? 3 00:00:18,400 --> 00:00:21,948 From 7 to 10, three hours. 4 00:00:25,733 --> 00:00:27,721 What is the mean? 5 00:00:33,116 --> 00:00:35,944 About 8.6 hours. 6 00:00:39,733 --> 00:00:41,889 What is the median? 7 00:00:43,983 --> 00:00:46,475 8.5 hours. 8 00:00:50,266 --> 00:00:52,206 What is the mode? 9 00:00:54,300 --> 00:00:58,784 8, 8.5 and 9, each three times. 10 00:01:04,083 --> 00:01:08,327 Phone time of 12 students, from least to most. 11 00:01:14,816 --> 00:01:16,996 What is the minimum? 12 00:01:19,083 --> 00:01:21,143 30 minutes. 13 00:01:24,933 --> 00:01:27,113 What is the maximum? 14 00:01:29,200 --> 00:01:31,956 150 minutes. 15 00:01:35,750 --> 00:01:37,810 What is the range? 16 00:01:42,400 --> 00:01:47,028 150 minus 30, 120 minutes. 17 00:01:50,816 --> 00:01:52,804 What is the mean? 18 00:01:58,200 --> 00:02:00,740 75 minutes. 19 00:02:04,533 --> 00:02:06,689 What is the median? 20 00:02:08,783 --> 00:02:11,923 67.5 minutes. 21 00:02:17,216 --> 00:02:20,404 Set A. Fourteen values. 22 00:02:20,500 --> 00:02:22,944 Look at the shape of Set A. 23 00:02:26,233 --> 00:02:31,701 High in the middle, low at the ends. Roughly symmetric. 24 00:02:34,300 --> 00:02:37,272 Set B. Eleven values. 25 00:02:37,366 --> 00:02:39,810 Look at the shape of Set B. 26 00:02:43,616 --> 00:02:49,180 High on the right, tail points left. Skewed left. 27 00:02:51,766 --> 00:02:55,074 Set C. Sixteen values. 28 00:02:55,166 --> 00:02:57,706 Look at the shape of Set C. 29 00:03:01,416 --> 00:03:06,980 High on the left, tail points right. Skewed right. 30 00:03:09,566 --> 00:03:15,658 Breakfast habits of 200 students. The bottom shows each habit. 31 00:03:15,750 --> 00:03:19,538 A bar chart of how often students eat breakfast. 32 00:03:21,633 --> 00:03:25,037 What do most students do for breakfast? 33 00:03:27,133 --> 00:03:32,361 Most eat breakfast every day. Eighty-five students. 34 00:03:34,150 --> 00:03:37,074 What is the shape of the distribution? 35 00:03:39,166 --> 00:03:42,138 It falls from every day to never. 36 00:03:43,933 --> 00:03:46,833 What can the school do to improve? 37 00:03:48,933 --> 00:03:53,417 Encourage the students who sometimes or never eat breakfast. 38 00:03:57,716 --> 00:04:02,536 Class 3. Twelve students took the test. 39 00:04:09,033 --> 00:04:11,669 What is the mean of Class 3? 40 00:04:17,066 --> 00:04:19,558 About 80.2. 41 00:04:23,350 --> 00:04:25,986 What is the range of Class 3? 42 00:04:30,583 --> 00:04:34,275 95 minus 65, 30. 43 00:04:39,566 --> 00:04:44,386 Class 4. Twelve students took the test. 44 00:04:50,883 --> 00:04:53,471 What is the mean of Class 4? 45 00:04:58,866 --> 00:05:01,790 About 77.9. 46 00:05:05,583 --> 00:05:08,195 What is the range of Class 4? 47 00:05:12,783 --> 00:05:16,163 100 minus 50, 50. 48 00:05:19,950 --> 00:05:24,890 Class 3 has a smaller range, so Class 3 is more consistent. 49 00:05:27,483 --> 00:05:32,279 Weekly exercise time of 10 students, from least to most. 50 00:05:38,166 --> 00:05:40,226 What is the range? 51 00:05:44,816 --> 00:05:49,156 300 minus 90, 210 minutes. 52 00:05:52,950 --> 00:05:54,938 What is the mean? 53 00:06:00,333 --> 00:06:03,353 165 minutes. 54 00:06:07,150 --> 00:06:09,306 What is the median? 55 00:06:11,400 --> 00:06:14,156 150 minutes. 56 00:06:17,950 --> 00:06:19,890 What is the mode? 57 00:06:21,983 --> 00:06:25,459 150, three students. 58 00:06:27,250 --> 00:06:33,294 The value 300 is much higher than the others. It is an outlier. 59 00:06:34,383 --> 00:06:38,428 Most students exercise about 150 minutes a 60 00:06:38,528 --> 00:06:42,179 week. One student exercises much more.