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Statistics: The branch of mathematics that deals with collecting, organizing, and analyzing or interpreting data.Data: Numerical facts or numerical information.Mean: average of all #’s (add up and divide)Median: the middle number.Mode: the number that appears the most.Range: the difference between the largest and smallest number.
8 4
StemLeaf
Leaf: The last digit on the right of the number.
Stem: The digit or digits that remain when the leaf is dropped.
= 84
Here are the scores from two periods of math class. Students took the same test.
Period 1: 77 79 85 58 97 94 82 81 75 63 60 92 75 98 83 58 72 57 70 81
Period 2: 57 60 88 85 79 70 65 98 97 59 58 65 62 77 77 75 73 69 82 81
Period 1: 85 58 94 81 75 63 60 92 75 83 57 72 57 70 81
*Step 1: Write the data in order from least to greatest.
57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94
Step 2: Divide the numbers into groups by their tens digit.
57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94
Step 3: Locate all of your stems (the number or numbers furthest to the left).
*Write them under the stem section of your stem and leaf plot.
57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94
STEM LEAF
5
6
7
8
9
Creating a Stem-and-Leaf Plot
Step 4: Locate all of your leaves (the number furthest to the right).
*Write them under the leaf section of your stem and leaf plot.
57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94 STEM LEAF
5
6
7
8
9
7 7 8
0 3
0 2 5 5
1 1 3 5
2 4
Creating a Stem-and-Leaf Plot
Step 5: Add a key!
STEM LEAF
5
6
7
8
9
7 7 8
0 3
0 2 5 5
1 1 3 5
2 4Key: 7 5 means 75Key: 7 5 means 75
Creating a Stem-and-Leaf Plot
Period 2: 99 55 95 55 92 59 60 67 63 67 88 72 87 75 79
*Step 1: Write the data in order from least to greatest.
55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99
Let’s Try AgainCreating a Stem-and-Leaf
Plot
Step 2: Divide the numbers into groups by their tens digit.
55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99
Step 3: Locate all of your stems (the number or numbers furthest to the left).
*Write them under the stem section of your stem and leaf plot.
55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99
STEM LEAF
Creating a Stem-and-Leaf Plot
Step 4: Locate all of your leaves (the number furthest to the right).
*Write them under the leaf section of your stem and leaf plot.
55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 STEM LEAF
5
6
7
8
Creating a Stem-and-Leaf Plot
9
Step 5: Add a key!!
Key: 6 0 means 60Key: 6 0 means 60
STEM LEAF
5
6
7
8
5 5 9
0 3 7 7
2 5 9
7 8
9 2 5 9
Comparing Two Sets of Data with a Stem-and-Leaf Plot
STEM LEAF
5
6
7
8
5 5 9
0 3 7 7
2 5 9
7 8
9 2 5 9
8 7 7
5 5 2 0 5 3 1 1
4 2
LEAF
3 0
Period 1
Period 2
Key: 7 5 5 means
57 55
Key: 7 5 5 means
57 55
Comparing Two Sets of Data with a Stem-and-Leaf Plot
Double Stem-and-Leaf Plot
Reading a Stem-and-Leaf Plot
What is the mean?
What is the range?
Reading a Stem-and-Leaf Plot
What is the median?
What is the mode?
Reading a Stem-and-Leaf Plot
Reading a Stem-and-Leaf Plot
Reading a Stem-and-Leaf Plot
On the paper you have, find the mean, median mode and range of the
following data represented in the stem-and-leaf plot.
