Chapter 1 Notes

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McDougal Littell Math Course 3
NYS edition

7th Grade Math

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Chapter 1 Notes

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

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