Warm Up
1.The sum of the values in a data set divided by the number of data values gives the
________________________.
2.Find the mean, median, mode, and range of the data set: 5, 3, 7, 6, 2, 4, 5, 8
3.Find the mean, median, mode, and range of the data set: 12, 15, 20, 16, 14, 13
Lesson 62, Displaying Data in
Stem and Leaf Plots and
Histograms
Statistics and Probability
Stem and Leaf Plots
• Stem and leaf plot: a data display, uses some digits as “stems” and others as “leaves”
• The stems have a greater place value than the leaves.
• The last digit is always the leaf. Other digits are the stem.
• Stem and leaf plots help us organize and display data to show the distribution
• Relative frequency: the number of times an event happens divided by the total number
of trials in an experiment
Histograms
• Histogram: a bar graph that displays the frequency of data in equal intervals
• Histograms show the distribution of data
• Each bar must be the same width
• Each bar should touch the bar next to it
Example
• The amount of money raised for a charity event by the homerooms at
Jefferson High School are shown below. Create a stem and leaf plot of
the data.
$150, $125, $134, $129, $106, $157, $108, $135, $144, $149
Example
• Use the stem and leaf plot to find the median, mode, range, and
relative frequency of 41.
Service Club Ages of
Members
Stem
2
3
4
5
6
Leaves
5, 6
0, 2, 3, 4, 4, 4, 8, 9
1, 1, 2, 6, 7
2, 5, 7
0, 4
Example
• The list shows the low temperatures in degrees Fahrenheit in New
Orleans for the first 15 days of April 2007. Create a stem and leaf plot
of the data and use it to create a histogram of the data.