Stem and Leaf Plots and Histograms

A stem-and-leaf plot shows data arranged from least to greatest and organized by place value. You can use a stem-and-leaf plot when you want to display data in an organized way that allows you to see each value

The “stems” are the tens digits of the data points. The “leaves” for each stem are all the ones digits in the data points that begin with that stem

The least stem and least leaf give the least value. The greatest stem and greatest leaf give the greatest value

Mean = (Sum of all the values) / (Number of items). Median = Mean of the two middle values for an even number of items when the data are arranged in numerical order

To find the mode, look for the number that occurs most often in a row of leaves. Then identify its stem. The range is the difference between the greatest and least value

For the horizontal axis, intervals should be equal and they must be chosen such that they cover all the values in the table

The scale must include all of the data values. The interval separates the scale into equal parts

The scale and interval should be chosen such that all the data values can be clearly marked on the graph

The horizontal axis is labeled with the equal intervals and the vertical axis is labeled with the scale (data values)

The height of each bar represents the frequency for that interval