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Chapter 1: Q 79. (page 70)
Quiz grades Joey’s first quiz grades in a marking period were
| 86 | 84 | 91 | 75 | 78 | 80 | 74 |
| 87 | 76 | 96 | 82 | 90 | 98 | 93 |
Calculate the mean. Show your work. Interpret your result in context.
Mean is Out of values, are above mean and are less than mean. Thus here mean is a balance point.
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Popular colours—here and there Favorite vehicle colours may differ among countries. The side-by-sidebar graph shows data on the most popular colours of cars in 2008 for the United States and Europe. Write a few sentences comparing the two distributions.
Olympic gold! The following table displays the total number of gold medals won by a sample of countries in the Summer Olympic Games in China.
(a) Make a dot plot to display these data. Describe the overall pattern of the distribution and any deviations from that pattern.
(b) Overall, countries participated in the Summer Olympics, of which won at least one gold medal. Do you believe that the sample of countries listed in the table is representative of this larger population? Why or why not?
U.S. women’s soccer— Earlier, we examined data on the number of goals scored by the U.S. women’s soccer team in games during the season. The dot plot below displays the goal differential for those same games, computed as the U.S. score minus the opponent’s score
(a) Explain what the two dots above represent.
(b) What does the graph tell us about how well the team did in ? Be specific.
The National Survey of Adolescent Health interviewed several thousand teens (grades to ). One question asked was “What do you think are the chances you will be married in the next ten years?” Here is a two-way table of the responses by gender:
The percentage of females among the respondents was
(a) (c) about . (e) None of these.
(b) (d) about 54%.
Birth days Births are not evenly distributed across
the days of the week. Here are the average numbers
of babies born on each day of the week in the United
States in a recent year.
(a) Present these data in a well-labelled bar graph.
Would it also be correct to make a pie chart?
(b) Suggest some possible reasons why there are
fewer births on weekends.
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