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MJ2. Ch 2.5 – Stem & Leaf Plots Quiz #3. Bellwork. Please take out your homework from yesterday and leave it on your desk for me to check Order from least to greatest, then calculate Mean, Median & Mode (Round to nearest 10 th ) 14, 5, 16, 7, 4, 15, 9, 7, 2, 14, 6

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### MJ2

Ch 2.5 – Stem & Leaf Plots

Quiz #3

Bellwork
• Please take out your homework from yesterday and leave it on your desk for me to check
• Order from least to greatest, then calculate Mean, Median & Mode (Round to nearest 10th)
• 14, 5, 16, 7, 4, 15, 9, 7, 2, 14, 6
• 29, 14, 80, 59, 78, 30, 59, 69, 55, 50
Objective
• Students will demonstrate their understanding of concepts covered in Ch 2.3 & 2.4
• Students will construct and interpret stem & leaf plots
Before we begin…
• Today you will take a quiz…
• The quiz is 5 questions worth 20 points each…this quiz will not take all period!
• You may write on the quiz form
• You must have a heading and use pencil (1 letter grade deduction each)
• You may use a calculator if you have one
Quiz
• Ch 2 Resource book p. 121
• \$110.00
• \$60.00
• 50 – 100; Between 20 & 50, 100 & 130; 20 and 30
• Mean 70.8, Median 70, Mode 60
• Mean and Median, more than half of the points are more than 60
After the quiz…
• Continuing with our theme of organizing and interpreting data…today we will look at stem & leaf plots…
Objective
• Students will construct and interpret stem and leaf plots
Stem & Leaf Plots
• Another useful way to organize data is a stem and leaf plot.
• In a stem and leaf plot the data is organized from least to greatest
• The one’s place value is always the leaf
• All other place values are the stem
• All stem & leaf plots must have a key!
• Lets look at some examples…
Identifying the Stems & Leaves

15

Stem Leaf

125

Stem Leaf

1227

Stem Leaf

Constructing a Stem & Leaf Plot

Data: 26,27,23,23,24,26,31,45,33,32,41,40,21,20

Demonstrate on board

Caution
• There should be at least 1 leaf for the first & last stem. There may be gaps in the data – where some stems have no leaves. Do not leave out these stems!
• Data that does not have a digit in the 10’s place have a stem of 0
• The key shows how the digits are related. Example 2/1 = 21
Analyzing the Data
• The stem & leaf plot allows you to describe the data. For example in our board example
• Raise your hand if you can identify
• The least value of the data
• The greatest value of the data
• Any outliers
• Any gaps in the data
• The stem & leaf plot also allows you to quickly identify measures of central tendency
• Raise your hand if you can:
• Identify the Range
• Identify the mode
• Identify the median
• In the notes section of your notebook copy the table and create a stem & leaf plot of the data.
• Don’t forget to put a key!
Summary
• In the notes section of your notebook summarize the key concepts covered in today’s lesson
• Today we discussed:
• Creating Stem & leaf Plots
Assignment
• Workbook Lesson 2.5 Practice Skills

Reminder:

• I do not accept late assignments
• This assignment is due tomorrow
• If you don’t finish the assignment in class you are to do it for homework!