1 00:00:00,660 --> 00:00:03,380 The government created the following stem-and-leaf plot 2 00:00:03,380 --> 00:00:07,200 showing the number of turtles at each major zoo in the country. 3 00:00:07,200 --> 00:00:10,630 How many zoos have fewer than 46 turtles? 4 00:00:10,630 --> 00:00:12,900 So what the stem-and-leaf plot does 5 00:00:12,900 --> 00:00:15,150 is it gives us the first digit in each number 6 00:00:15,150 --> 00:00:17,600 and essentially you could call this the tens place. 7 00:00:17,600 --> 00:00:19,100 And then it gives us the ones place. 8 00:00:19,100 --> 00:00:21,570 So there was only one zoo that had four turtles. 9 00:00:21,570 --> 00:00:26,130 So you could view this as 0, 0, 4, or 4 turtles. 10 00:00:26,130 --> 00:00:30,510 Then everything here, the tens place, is a 1. 11 00:00:30,510 --> 00:00:33,160 So this number right here is really an 11. 12 00:00:33,160 --> 00:00:34,800 This is a 14. 13 00:00:34,800 --> 00:00:37,790 This right over here would be a 16. 14 00:00:37,790 --> 00:00:40,510 That's a 16, and so forth and so on. 15 00:00:40,510 --> 00:00:42,160 This would be 17, 18. 16 00:00:42,160 --> 00:00:43,350 All of this is 23. 17 00:00:43,350 --> 00:00:44,060 This is 23. 18 00:00:44,060 --> 00:00:46,660 This is 26 because we have our tens place right over here. 19 00:00:46,660 --> 00:00:48,120 This is the first digit. 20 00:00:48,120 --> 00:00:49,350 So let's answer the question. 21 00:00:49,350 --> 00:00:52,940 How many zoos have fewer than 46 turtles? 22 00:00:52,940 --> 00:00:56,670 So there are no zoos that had 40 anything turtles. 23 00:00:56,670 --> 00:00:58,770 And so all of these zoos here-- so all of these 24 00:00:58,770 --> 00:01:01,990 had 30 something turtles, these had 20 something turtles, 25 00:01:01,990 --> 00:01:04,519 these have in the teens, this has single digits. 26 00:01:04,519 --> 00:01:07,190 So it's literally as many zoos as we have listed here. 27 00:01:07,190 --> 00:01:16,164 So 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17. 28 00:01:16,164 --> 00:01:19,610 17 zoos have fewer than 46 turtles. 29 00:01:19,610 --> 00:01:21,700 Let's do another one. 30 00:01:21,700 --> 00:01:23,384 The buyer for a chain of supermarkets 31 00:01:23,384 --> 00:01:25,050 created the following stem-and-leaf plot 32 00:01:25,050 --> 00:01:28,060 showing the number of coconuts at each of the stores. 33 00:01:28,060 --> 00:01:32,370 What was the smallest number of coconuts at any one grocery 34 00:01:32,370 --> 00:01:33,274 store? 35 00:01:33,274 --> 00:01:34,940 So the buyer for a chain of supermarkets 36 00:01:34,940 --> 00:01:36,606 created the following stem-and-leaf plot 37 00:01:36,606 --> 00:01:39,580 showing the number of coconuts at each of the stores. 38 00:01:39,580 --> 00:01:42,750 So at any one grocery store the smallest number-- well, 39 00:01:42,750 --> 00:01:44,710 that's this one right over here. 40 00:01:44,710 --> 00:01:45,835 And remember, it's not two. 41 00:01:45,835 --> 00:01:47,501 We have our tens places right over here. 42 00:01:47,501 --> 00:01:48,100 It's a one. 43 00:01:48,100 --> 00:01:49,516 So this right over here represents 44 00:01:49,516 --> 00:01:51,380 12 coconuts at that store. 45 00:01:51,380 --> 00:01:53,940 So we'll put 12 right over here. 46 00:01:53,940 --> 00:01:55,770 Let's try another one. 47 00:01:55,770 --> 00:01:58,344 A statistician for a chain of department stores 48 00:01:58,344 --> 00:02:00,010 created the following stem-and-leaf plot 49 00:02:00,010 --> 00:02:02,950 showing the number of watches at each of the stores. 50 00:02:02,950 --> 00:02:06,830 How many department stores have exactly seven watches? 51 00:02:06,830 --> 00:02:11,210 Well that's only this one right over here-- 07 watches. 52 00:02:11,210 --> 00:02:14,770 This one, this, this, and that one are not 7. 53 00:02:14,770 --> 00:02:17,910 This is representing 17 because it's in the row with 1 54 00:02:17,910 --> 00:02:18,950 at the beginning. 55 00:02:18,950 --> 00:02:22,560 This right over here represents 27 56 00:02:22,560 --> 00:02:24,730 because it's in the row with the 2 at the beginning. 57 00:02:24,730 --> 00:02:29,100 So there's only one store that has exactly seven watches. 58 00:02:29,100 --> 00:02:29,890 Let's do one more. 59 00:02:29,890 --> 00:02:31,390 This is kind of fun. 60 00:02:31,390 --> 00:02:33,910 A zookeeper created the following stem-and-leaf plot 61 00:02:33,910 --> 00:02:36,520 showing the number of tigers at each major zoo in the country. 62 00:02:36,520 --> 00:02:39,790 How many zoos have more than 24 tigers? 63 00:02:39,790 --> 00:02:42,840 So we can ignore the zeros and the teens 64 00:02:42,840 --> 00:02:44,110 and we get in the 20s. 65 00:02:44,110 --> 00:02:45,200 This is 25. 66 00:02:45,200 --> 00:02:46,460 So that meets the criteria. 67 00:02:46,460 --> 00:02:48,880 And then you go to 28, 29. 68 00:02:48,880 --> 00:02:51,810 So all of these in the 30s and all of these right over here. 69 00:02:51,810 --> 00:02:53,720 This 3, 0-- this doesn't mean 0 tigers. 70 00:02:53,720 --> 00:02:54,870 This is 30 tigers. 71 00:02:54,870 --> 00:02:56,520 This is 40 tigers. 72 00:02:56,520 --> 00:03:02,480 So we count 1, 2, 3, 4, 5, 6, 7, 8, 9, 9 73 00:03:02,480 --> 00:03:05,420 zoos have more than 24 tigers. 74 00:03:05,420 --> 00:03:06,650 9 zoos. 75 00:03:06,650 --> 00:03:08,400 And we're done.