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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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Presentation Transcript
slide1

MJ2

Ch 2.5 – Stem & Leaf Plots

Quiz #3

bellwork
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
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
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
  • Please clear your desk…
slide5
Quiz
  • Ch 2 Resource book p. 121
quiz answers
Quiz Answers
  • $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
After the quiz…
  • Please pass your quiz papers forward…
  • Please take out your notebook and get ready to work…
  • Continuing with our theme of organizing and interpreting data…today we will look at stem & leaf plots…
objective1
Objective
  • Students will construct and interpret stem and leaf plots
stem 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
Identifying the Stems & Leaves

15

Stem Leaf

125

Stem Leaf

1227

Stem Leaf

constructing a stem leaf plot
Constructing a Stem & Leaf Plot

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

Demonstrate on board

caution
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
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
your turn
Your Turn
  • 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
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
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!