http://www.ck12.org Chapter 7. Organizing and Displaying Data - Basic
- A research firm has just developed a streak-free glass cleaner. The product is sold at a number of local chain
stores and its sales are being closely monitored. At the end of one year, the sales of the product are released.
The company is planning on starting up an Ad Campaign to promote the product. The data is found in the
chart below.
266 94 204 164 219 163
87 248 137 193 144 89
175 164 118 248 159 123
220 141 122 143 250 168
100 217 165 226 138 131
Display the sales of the product before the Ad campaign in a stem-and-leaf plot.- Answer the following questions with respect to the above stem-and-leaf plot.
a. How many chain stores were involved in selling the streak-free glass cleaner?
b. In stem 1, what does the number 11 represent? What does the number 8 represent?
c. What percentage of stores sold less than 175 bottles of streak-free glass cleaner?Review Answers
- The snowfall amount in inches.
- The scale is each block = 20 inches.
- The name of the city.
- Vancouver
- Moncton
- Edmonton and Toronto
- Answers will vary
1. 96%
- Some casual workers work in other departments
- 40-49
- 50-59
- The responses for the question “What is your favorite beverage?” would be specific names. There is no
range in the data. Therefore a bar graph would be used. The beverage would be on thex−axis and the
number of students would be on they−axis. ABarGraph would be used. - The results would have to be grouped in intervals since each result represents a specific time. The time
intervals would be on thex−axis and the number of students would be on they−axis. AHistogram
would be used. - Once again a histogram would be used since the results would have to be grouped in intervals since each
result represents a specific distance. The distance intervals would be on thex−axis and the number of
people would be on they−axis.