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58 Chapter 1 %u2022 Analyzing One-Variable Data0.200.150.10 Relative f0.050.004.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0Sepal length (cm)0.300.350.400.250.200.150.10VersicolorRelative frequency Relative frequency0.050.004.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0Sepal length (cm)0.300.350.250.200.150.10Virginia0.050.004.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0Sepal length (cm)0.4022. Do the math The histograms display the distributions of score earned by students taking the AP%u00ae Calculus AB, AP%u00ae Calculus BC, and AP%u00ae Statistics exams in a recent year.67 Compare the three distributions. Relative frequency0.450.350.400.300.250.200.150.100.050.001 2 3 4 5Exam scoreCalculus ABRelative frequency0.450.400.350.300.200.250.100.150.000.0512345Exam scoreCalculus BCRelative frequency0.450.250.300.350.400.200.150.100.050.001234 5Exam scoreStatisticsExtending the Concepts23. Population pyramids The histograms show the age distributions of the population in Australia and Ethiopia in a recent year from the U.S. Census Bureau%u2019s international database.68 (This type of graph is referred to as a population pyramid.)10 5 0 5 10 15Percentage of populationAge0102030405060708090100EthiopiaAustralia(a) The total population of Australia at this time was about 26 million. Ethiopia%u2019s population was about 111 million. Why did we use percentages rather than counts on the horizontal axis?(b) What important differences do you see between the age distributions? Be specific.24. Rolling the die Imagine rolling a fair, six-sided die 60 times. Should you use a bar chart or histogram to display the data? Draw a plausible (believable) graph of the distribution of die rolls.Recycle and Review25. Communicate, eh? (1.2) We chose a random sample of 50 Canadian students who completed an online survey that included the question %u201cWhich of these methods do you most often use to communicate with your friends?%u201d The graph displays data on students%u2019 responses. Would it be correct to %u00a9 Bedford, Freeman & Worth Publishers. For review purposes only. Do not distribute.