Chapter 1 Notes
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Chapter 1 Notes

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McDougal Littell Math Course 3

McDougal Littell Math Course 3
NYS edition

7th Grade Math

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Chapter 1 Notes Chapter 1 Notes Presentation Transcript

  • Chapter 1
  • Frequency Tables and Histograms
    • Frequency Table : a table of data grouped into equal intervals. Does not overlap.
    • Histogram- Vertical graph of frequencies. Bars touch.
    • Age of teens who visited the mall yesterday:
    • 14,15,19,13,14,15,18,14,18,17,13,17,13,17,16
    15 5 11111 17-18 1 111 111111 Tally 1 19-20 3 15-16 6 13-14 Frequency Ages 13-14 17-18 15-16 19-20
  • How to make a frequency table:
    • 1. Choose intervals of equal size that include all data.
    • 2. Tally the data at each interval.
    • 3. Write the frequency for each interval.
    • 4. Count to be sure you included all data
  • Collect data about the number of pets each person in the class has.
    • Make a frequency table to show the amount of pets
    • each student in the class has:
    • List the numbers first:
    Tally Frequency # of Pets
  • How to Draw a Histogram
    • Title the graph.
    • Draw and label the horizontal and vertical axes. (start the vertical scale at zero and use equal increments)
    • Draw a bar to represent the frequency for each interval. Make sure they are touching
  • Create another frequency table
    • The data shows the heights in meters, of some of the tallest roller coasters in the world:
    • 66.4, 94.5, 68.3, 115, 62.5, 97, 66.4, 126.5, 63.4, 74.7, 63.4, 70.1, 66.4, 64.9, 63.7, 79, 63.4, 63.1, 62.5, 61.9, 71.6
    Tally Frequency Height (M) Tally Frequency Height (M)
  •