So if needed, you can just take a look to get an idea of the spread of the data or you can use the values to calculate the mean, median or mode. It is a great visual that also includes the data. Let's Review: A stem and leaf plot is a great way to organize data by the frequency. Step 3: Add a key to the bottom of the stem and leaf plot. Now we are ready to add the ones place from each of the values in the list we made. Step 2: Create the plot with the stems as the tens and the leaves as the ones. From the given stem and leaf, 7 data values are less than 48 kg. a) Locate the median, upper and lower quartiles, and maximum and minimum. A sample of bags is carefully weighed, and the measurements are given in the ordered stem-and-leaf plot shown. In this situation, we will group the tests by decades. Find Median Lower Upper and Interquartile Range from. Step 1: In order to create a stem and leaf plot, we need to first organize the data into groups. Here is a set of data on showing the test scores on the last science quiz.ĥ6, 78, 82, 82, 90, 94, 93, 67, 67, 69, 74, 77, 92, 88, 81, 83, 84, 77, 72 So basically, stem plots allows you to accurately see a distribution of the figures, while a box plot tells you about the median, upper/lower quartiles, the. Recall that a histogram shows the data in intervals. The median is 33, since there are 13 values above and below that point, and the extremes are 12 and 53 since those are the greatest and least values in the sample. What is even better, is that after you get the quick visual, you have the actual values in the plot to work with as well.Ī stem and leaf plot can quickly be turned into a histogram as well to show the data using bars. Stem and leaf plots are a great way to visually see what age groups are at the party. So half the guests are younger than 28 and half are older than 28. Here we can see that the median is 28 years old. We can also easily get the median be finding the middle of the leaves. This represents the mode because it is the age that appears the most. With the numbers ordered on the leaf side of the plot, we can also see that there are 4 children that are 4 years old. Looking across the rows, we can see that there are 9 people in their 30s and 4 people in their 40s. Stem and leaf plots are similar to horizontal bar graph, but the actual numbers are used instead of bars. We can also see that the youngest person at the party was 01, or 1 year old. Now we can see that the oldest person at the party is 66 years old. The key on this plot shows that the stem is the tens place and the leaf is the ones place. It will guide you on how to read the other values. When reading a stem and leaf plot, you will want to start with the key. The Stem and Leaf Plot is an interesting way to showcase data.Ĭheck out the example showing ages at a birthday party. Stem and Leaf Plot Part 1: Reading a Stem and Leaf Plot
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