WEBVTT 00:00:00.000 --> 00:00:00.660 00:00:00.660 --> 00:00:03.380 The government created the following stem-and-leaf plot 00:00:03.380 --> 00:00:07.200 showing the number of turtles at each major zoo in the country. 00:00:07.200 --> 00:00:10.630 How many zoos have fewer than 46 turtles? 00:00:10.630 --> 00:00:12.900 So what the stem-and-leaf plot does 00:00:12.900 --> 00:00:15.150 is it gives us the first digit in each number 00:00:15.150 --> 00:00:17.600 and essentially you could call this the tens place. 00:00:17.600 --> 00:00:19.100 And then it gives us the ones place. 00:00:19.100 --> 00:00:21.570 So there was only one zoo that had four turtles. 00:00:21.570 --> 00:00:26.130 So you could view this as 0, 0, 4, or 4 turtles. 00:00:26.130 --> 00:00:30.510 Then everything here, the tens place, is a 1. 00:00:30.510 --> 00:00:33.160 So this number right here is really an 11. 00:00:33.160 --> 00:00:34.800 This is a 14. 00:00:34.800 --> 00:00:37.790 This right over here would be a 16. 00:00:37.790 --> 00:00:40.510 That's a 16, and so forth and so on. 00:00:40.510 --> 00:00:42.160 This would be 17, 18. 00:00:42.160 --> 00:00:43.350 All of this is 23. 00:00:43.350 --> 00:00:44.060 This is 23. 00:00:44.060 --> 00:00:46.660 This is 26 because we have our tens place right over here. 00:00:46.660 --> 00:00:48.120 This is the first digit. 00:00:48.120 --> 00:00:49.350 So let's answer the question. 00:00:49.350 --> 00:00:52.940 How many zoos have fewer than 46 turtles? 00:00:52.940 --> 00:00:56.670 So there are no zoos that had 40 anything turtles. 00:00:56.670 --> 00:00:58.770 And so all of these zoos here-- so all of these 00:00:58.770 --> 00:01:01.990 had 30 something turtles, these had 20 something turtles, 00:01:01.990 --> 00:01:04.519 these have in the teens, this has single digits. 00:01:04.519 --> 00:01:07.190 So it's literally as many zoos as we have listed here. 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. 00:01:16.164 --> 00:01:19.610 17 zoos have fewer than 46 turtles. 00:01:19.610 --> 00:01:21.700 Let's do another one. 00:01:21.700 --> 00:01:23.384 The buyer for a chain of supermarkets 00:01:23.384 --> 00:01:25.050 created the following stem-and-leaf plot 00:01:25.050 --> 00:01:28.060 showing the number of coconuts at each of the stores. 00:01:28.060 --> 00:01:32.370 What was the smallest number of coconuts at any one grocery 00:01:32.370 --> 00:01:33.274 store? 00:01:33.274 --> 00:01:34.940 So the buyer for a chain of supermarkets 00:01:34.940 --> 00:01:36.606 created the following stem-and-leaf plot 00:01:36.606 --> 00:01:39.580 showing the number of coconuts at each of the stores. 00:01:39.580 --> 00:01:42.750 So at any one grocery store the smallest number-- well, 00:01:42.750 --> 00:01:44.710 that's this one right over here. 00:01:44.710 --> 00:01:45.835 And remember, it's not two. 00:01:45.835 --> 00:01:47.501 We have our tens places right over here. 00:01:47.501 --> 00:01:48.100 It's a one. 00:01:48.100 --> 00:01:49.516 So this right over here represents 00:01:49.516 --> 00:01:51.380 12 coconuts at that store. 00:01:51.380 --> 00:01:53.940 So we'll put 12 right over here. 00:01:53.940 --> 00:01:55.770 Let's try another one. 00:01:55.770 --> 00:01:58.344 A statistician for a chain of department stores 00:01:58.344 --> 00:02:00.010 created the following stem-and-leaf plot 00:02:00.010 --> 00:02:02.950 showing the number of watches at each of the stores. 00:02:02.950 --> 00:02:06.830 How many department stores have exactly seven watches? 00:02:06.830 --> 00:02:11.210 Well that's only this one right over here-- 07 watches. 00:02:11.210 --> 00:02:14.770 This one, this, this, and that one are not 7. 00:02:14.770 --> 00:02:17.910 This is representing 17 because it's in the row with 1 00:02:17.910 --> 00:02:18.950 at the beginning. 00:02:18.950 --> 00:02:22.560 This right over here represents 27 00:02:22.560 --> 00:02:24.730 because it's in the row with the 2 at the beginning. 00:02:24.730 --> 00:02:29.100 So there's only one store that has exactly seven watches. 00:02:29.100 --> 00:02:29.890 Let's do one more. 00:02:29.890 --> 00:02:31.390 This is kind of fun. 00:02:31.390 --> 00:02:33.910 A zookeeper created the following stem-and-leaf plot 00:02:33.910 --> 00:02:36.520 showing the number of tigers at each major zoo in the country. 00:02:36.520 --> 00:02:39.790 How many zoos have more than 24 tigers? 00:02:39.790 --> 00:02:42.840 So we can ignore the zeros and the teens 00:02:42.840 --> 00:02:44.110 and we get in the 20s. 00:02:44.110 --> 00:02:45.200 This is 25. 00:02:45.200 --> 00:02:46.460 So that meets the criteria. 00:02:46.460 --> 00:02:48.880 And then you go to 28, 29. 00:02:48.880 --> 00:02:51.810 So all of these in the 30s and all of these right over here. 00:02:51.810 --> 00:02:53.720 This 3, 0-- this doesn't mean 0 tigers. 00:02:53.720 --> 00:02:54.870 This is 30 tigers. 00:02:54.870 --> 00:02:56.520 This is 40 tigers. 00:02:56.520 --> 00:03:02.480 So we count 1, 2, 3, 4, 5, 6, 7, 8, 9, 9 00:03:02.480 --> 00:03:05.420 zoos have more than 24 tigers. 00:03:05.420 --> 00:03:06.650 9 zoos. 00:03:06.650 --> 00:03:08.400 And we're done.