2. Aim: How do we construct a cumulative frequency table/histogram?

3. To create a Cumulative Frequency Table we must: Construct a Frequency table (intervals) Extend the Table to include a cumulative frequency column The C. Freq. Column is calculated by starting from the bottom and adding each Freq. to the C. Frequency recorded on the previous row.

4. Frequency Table 10 90 150 200 30

5. To create a Cumulative Frequency Histogram: Construct a Cumulative Frequency table Draw/Label the Horizontal Axis (intervals) Draw/Label the Vertical Axis “Cumulative Frequency” Graph the Bars (No Gaps) Last bar should contain the total frequency Title the Graph …..The words “cumulative frequency” should appear in the title.

6. Horizontal axis (left to right) Label the horizontal axis with the appropriate intervals. Name the axis ……Test scores If the Intervals do not begin at 0 use a “break” symbol on the axis 51-60 51-70 51-80 51-90 51-100 Test Scores (Intervals)

7. Vertical Axis (up and down) Begin at zero Number the Vertical Axis. Label the axis “ Cumulative Frequency” Cumulative Frequency Test Scores(Interval) 150 100 50 0

8. Graph it…. (no gaps= no gaps) 51-60 51-70 51-80 51-90 51-100

9. Graph it…. (no gaps= no gaps) 51-60 51-70 51-80 51-90 51-100