StemandLeaf Plot

1
Stem-and-Leaf Plot

• Lesson 2-5
• Page 76-79

2
What is a Stem-and-Leaf Plot?

• A system used to condense a set of data where the
  greatest place value of the data forms the stem
  and the next greatest place value forms the
  leaves
• The data is organized from least to greatest

3
What is the LEAF?

• The second greatest place value of data in a
  stem-and-leaf plot
• The number that is in the ones place in a
  number
• EX.
• 12 -gt 2 is the leaf

4
What is the STEM?

• The greatest place value common to all the data
  values is used for the stem of a stem-and-leaf
  plot
• All the other numbers that are NOT in the leaf
• EX.
• 12 -gt 1 is the stem

STEM
5
Lets construct a stem-and-leaf plot with the
following data.

• Mrs. Simmons 3rd Period Mathematics class
  received the following scores on the test for
  Chapter 1
• 50, 61, 78, 85, 98, 78, 92, 74, 79, 68, 52, 67,
  92, 83, 58, 64, 72, 50, 58, 64, 76, 96

6
Put the numbers in numerical order from least
to greatest

• 50, 61, 78, 85, 98, 78, 92, 74, 79, 68, 52, 67,
  92, 83, 58, 64, 72, 50, 58, 64, 76, 96
• 50, 50, 52, 58, 58, 61, 64, 64, 67, 68, 72, 74,
  76, 78, 78, 79, 83, 85, 92, 92, 96, 98

7
Create a stem-and-leaf plot table
8
Put the data in the table
9
Your Turn

• Put the following data in a stem-and-leaf plot.
• The table shows the average amounts of pasta that
  people in different countries consume each year.
  Make a stem-and-leaf plot of the data.

Source National Pasta and National Restaurant
Associations
10
Answer
3, 4, 5, 8, 8, 9, 9, 10, 11, 14, 15, 15, 15, 15,
15, 19, 20, 20, 28, 59
11
What If?

• What do you do if you have a number greater than
  the tens place?
• Example
• 99, 98, 102, 85, 87, 98, 115

10 l 2 means 102 11 l 5 means 115
12
What is Range?

• The difference between the greatest and the least
  numbers in a data set.
• Example
• Refer the table about Pasta per Country.
• Greatest number 59
• Least number 3
• Subtract the two numbers gt 59 3 56

13
Assignment

• Page 78 5-17
• Bonus Page 79 -gt 24-36