http://www.ck12.org Chapter 7. Organizing and Displaying Data - Basic
From this graph, you can answer many of the following questions:
Questions
- What was the fastest time for the 100m dash in the year 2000?
- Between what two years was there the greatest decrease in the fastest time to complete the 100m dash?
- As the years pass, why do think runners are completing the race in a faster time?
Answers
- 11.2 seconds
- Between 2001 and 2002; Between 2008 and 2009
- The runners are living a healthier and more active life style.
A broken line graph can be extended to include two broken lines. This type of a line graph is very useful when you
have two sets of data that relate to the same topic but are from two different sources. For example the deaths in a
small town over the past ten years can be graphed on a broken line graph. To extend this data, natural deaths could be
plotted along with the deaths that were the result of traffic accidents. With both lines on the same graph, comparing
them would be made easier.
Example 6:Jane has operated an ice-cream parlor for many years. She has decided to retire and is anxious to sell
her business. In order to show interested buyers the ice cream sales for the past two years, she has decided to show
these sales on a double line graph. She will use the graph to show buyers what month had the highest sales, when
the greatest change in sales occurs and to show them when an unexpected increase in sales occurs. Following is the
information that Jane has recorded for the monthly sales during the years 2008 and 2009. Can you help Jane by
using the double line graph to answer the questions?
Solution: