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13.3 Stem-and-Leaf Plots
SWBAT read and make single and back-to-back stem-and-leaf plots
SWBAT compare sets of data given in stem-and-leaf plots
SWBAT find measures of central tendency from data displayed on stem-and-leaf plots
Vocabulary Stem-and-Leaf Plot- a type of graph that arranges
numerical data in order of place value
Measures of central tendency- used to describe sets of data; represent a centralized or middle value
Mean- the average number
Median- the middle number or mean of the two middle numbers
Mode- the number(s) that occur most often
How to make a stem-and-leaf plot
Label two table columns Stem and Leaf
Use all the digits to the left of the last digit of each data value as the stems. List these digits in increasing order down the stem column
Use the far right digit(s) of each datum for the leaves. Write each leaf to the right of its stem in increasing order
Write a key to show the meaning of each datum in the plot
Write a title for the graph
Make a stem-and-leaf plot for the given data. Then find the measures of central tendency
for the dataWeights of Twenty Teenagers (in kg)
53 72 51 38 43 49 64
48 40 58 47 48 56 68
Weights of Twenty Teenagers (in Kg)
Stem Leaf
3 8
4 0 3 7 8 8 9
5 1 3 6 8
6 4 8
7 2
Mean: 52.5Median: 50Mode: 48
Mass in Kilograms
53 72 51 38 43 49 64 49 60 62
48 40 58 47 48 56 68 45 51 60
Make a stem-and-leaf plot for the given data. Then find the measures of central tendency
for the data
Mass in Kilograms
Stem Leaf
3 8
4 0 3 5 7 8 8 9 9
5 1 1 3 6 8
6 0 0 2 4 8
7 2
Mean: 53.1 kgMedian: 51Modes: 48, 49, 51, 60
Back-to-back-stem-and-leaf plots
Minimum and Maximum Monthly Temperatures 2000-2009
Month Minimum Maximum
Jan 17 34
Feb 19 36
March 28 45
April 37 56
May 47 67
June 55 75
July 61 80
August 59 78
September 52 71
October 41 61
November 33 49
December 23 39
Back-to-Back Stem-and-Leaf Plot
Minimum and Maximum Monthly Temperature 2000-2009
Minimum Temp Stem Maximum Temp
9 7 1
8 3 2
7 3 3 4 6 9
7 1 4 5 9
9 5 2 5 6
1 6 1 7
7 1 5 8
8 0
