7th Grade Math

508 Statistical Displays

10. ANIMALS Use the double box-and-whisker plot. It summarizes the
    weights of Asiatic black bears and pandas.

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PG
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MC

175 200 225 250 275 300 325 350 375 400
Asiatic Black
Bears
Pandas
a. How do the weights of the two types of animals compare? Discuss
how much the majority of the animals of each type weigh and the
greatest weight of each.
b. Compare and contrast the range and variance of the weights of each
animal.
1111 TEMPERATURE Use the table. It shows the average monthly temperatures
for two cities.
Average Monthly Temperatures (°F)
J FMAM J J A S OND
Brownsville, TX 59 62 69 75 80 83 85 85 82 76 69 62
Caribou, ME 9 1225385161666354433115
a. Find the low, high, and median temperatures and the upper and lower
quartiles for each city.
b. On the same number line, draw a double box-and-whisker plot for each
set of data. Place the Caribou data above the Brownsville data.
c. Write a few sentences comparing the average monthly temperatures
displayed in the box-and-whisker plots.
B 12. WORD PROCESSING Find the median, upper and Words Typed Per Minute
80 72 67 51 77
42 63 73 68 55
65 81 40 59 78
lower quartiles, and the interquartile range for the
set of data in the table at the right. Create a box-
and-whisker plot of the data.
C 13. CHALLENGE Write a set of data that contains 12 values for which the
box-and-whisker plot has no whiskers. State the median, lower and
upper quartiles, and lower and upper extremes.

14. REASONING Determine whether the statement is true or false. Explain.
    The median divides the box of a box-and-whisker plot in half.


15. OPEN ENDED Write a set of data that, when displayed in a box-and-
    whisker plot, will result in a long box and short whiskers. Draw
    the box-and-whisker plot.


16. E WRITE MATH Explain how the information you can learn from a set
    of data shown in a box-and-whisker plot is different from what you can
    learn from the same set of data shown in a stem-and-leaf plot.

Real-World Link

Asiatic black

bears range from

4 to 6 feet in

length.

RRR

A

498_509_C09_L2_895130.indd 508 1/11/10 9:35 AM