1.4 Stem-and-Leaf Plots, Histograms, and Circle Graphs Objectives: Make and interpret a stem-and-leaf plot, a histogram Standards: 2.6.5A Organize and display data using pictures, tallies, tables, charts, bar and circle graphs E Analyze and display data in a stem-and-leaf plot. and circle graphs E Analyze and display data in a stem-and-leaf plot.

Do Now Order the data from least to greatest. 78, 95, 92, 84, 86, 82, 74, 73, 70, 86, 90, 91,81, 85, 89

Definition: A stem-and-leaf plot is a graph that splits data into 2 parts: a stem and leaf. StemLeaf

The numbers of defective widgets in batches of 1000 are given below. Use the data to make a stem-and- leaf plot. 14, 12, 8, 9, 13, 20, 15, 9, 21, 8, 13, 19 Number of Defective Widgets per Batch Stem Leaves The tens digits are the stems. The ones digits are the leaves. List the leaves from least to greatest within each row. Title the graph and add a key. Key: 1|9 means 19

Example 1 Organize data from the Do Now using a stem-and-leaf plot. Include a key

Ex2. A bakery collected the following data about the # of loaves of bread sold each of the 24 business days: 53, 49, 27, 48, 60, 52, 44, 38, 47, 52, 82,46, 55, 31, 39, 54, 51, 47, 50, 45, 50, 61, 43, and 64. Make a stem-and-leaf plot of the data. Find the median and mode(s) of the data. How can the owner use the stem-and-leaf plot to make plans for baking bread?

II.Histogram – a bar graph that shows the frequency of each value. See Textbook Pg. 59

*Ex 2. The given data shows the # of people in 24 vehicles hat passed a designated checkpoint. 1, 4, 1, 2, 2, 1, 3, 1, 3, 2, 2, 6, 4, 2, 1, 1, 2, 4, 3, 1, 2, 4, 2, 3. Make a frequency table for these data. Make a histogram from the frequency table. #Frequency

Practice Textbook: p.62/1,3,5 P.65/10

Exit Question A. When would you use a stem and leaf plot to display data? B. When would you use a histogram to display data?

Review of Stem-and-Leaf Plots, Histograms, and Circle Graphs