Similarly, the key 4 | 0 2 3 8 represents the ages 40, 42, 43 and 48, which we have in the survey and here, 4 is the stem and 0 is the leaf. We can see in the above the stem and leaf plot that the key 3 | 7 means that it represents the age 37. How can plot the above information using a stem and leaf plot? Let us find out. The leaves are listed in increasing order in a row to the right of each corresponding stem.Įxample Suppose we have the following age in years for 15 people obtained from a certain survey – 70, 56, 37, 69, 70, 40, 66, 53, 43, 70, 54, 42, 54, 48, 68.Each stem is listed, even if some stems have no leaves. The stems are listed down in the left column.The stem and leaf plot is drawn in a table with two columns.The stem and leaf plot is used when your data is not too large, i.e.The stem is the first digit or digits, while the leaf is the last digit.Characteristics of a Stem and Leaf Plotįollowing are the characteristics of a stem and leaf plot –
What are the characteristics of the stem and the leaf in this plot? Let us find out. A stem and leaf plot is called so as in this plot each numerical data value is split into a stem which is the first digit or digits and a leaf. In other words, the stem and leaf plot is a plot used to represent numerical data by showing its distribution.
#Find outliers on a stem plot how to#
As you continue to learn about stemplots, you might find it useful to now study how to make one. Just remember to pay attention to the key and that each leaf represents a data value and you’ll have no trouble at all. While this doesn’t cover absolutely every question you could see from a stemplot, it definitely covers all the skills you would need to answer most. This means that 5 different sales were for $65, and that $65 is the most common price that a card has sold for thus far. If you look in the row for 6, you will see that 65 was observed 5 times. The mode represents the most commonly observed value. The mode doesn’t get used too much, but it is a good test of whether or not you can read a stemplot. Note that you could also find the mean sale price by adding all the values and dividing by 24, but with the outlier of $150, the median is a better measure of center. The middle two values would be the 12th and 13th values.
If there are an even number of values, then it is the average of the middle two. Recall that the median is the middle value, when the values are placed in order from smallest to largest. The lowest sale price of any card so far is $34 while the highest is $150. The values on the stemplot are all in order from smallest to largest (if you look from top to bottom). (b) What is the lowest sale price? the highest? Since each leaf represents a single data value, we can just count the number of leaves in the stemplot.īased on this, so far they have sold 24 total cards. This is important to consider when answering these questions! (a) How many cards have they sold? (b) What was the lowest sale price? the highest?įrom the key, we can see that the leafs represent the ones digit. Using this, we will answer the following questions about the sale prices so far. They have kept track of all of their sales so far and plotted them on the stemplot below. So let’s suppose that someone has been selling their old baseball card collection online card by card. Using this idea, let’s try to answer some questions. Each leaf represents a single value in the data set. For any stemplot, you will see the leaves on the right hand side of the bar. When we read stemplots, we need to keep this in mind. Stemplots are sometimes called stem and leaf plots because each number in the original data set has been broken up into two pieces: a stem and a leaf.
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