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Frequency Tables, Line Plots, and Histograms PRE-ALGEBRA LESSON 12-1 (For help, go to Lesson 3-3.) Find the median and mode of each data set. 1.6, 9, 9, 5, 92.73, 78, 77, 73, 79 3.300, 100, 200, 150, 3004.3, 5, 7, 9, 3, 4, 6, 3, 7 Check Skills You’ll Need 12-1

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PRE-ALGEBRA LESSON 12-1 Solutions 1.5, 6, 9, 9, 9 2.73, 73, 77, 78, 79 median = 9median = 77 mode = 9mode = 73 3.100, 150, 200, 300, 3004.3, 3, 3, 4, 5, 6, 7, 7, 9 median = 200median = 5 mode = 300mode = 3 Frequency Tables, Line Plots, and Histograms 12-1

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A survey asked 22 students how many hours of TV they watched daily. The results are shown. Display the data in a frequency table. PRE-ALGEBRA LESSON 12-1 1 3 4 3 1 1 2 3 4 1 3 2 2 1 3 2 1 2 3 2 4 3 NumberTallyFrequency List the numbers of hours in order. 1 2 3 4 Count the tally marks and record the frequency. 3 7 6 6 Use a tally mark for each result. ||| |||| | |||| || Frequency Tables, Line Plots, and Histograms Quick Check 12-1

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Twenty-one judges were asked how many cases they were trying on Monday. The frequency table below shows their responses. Display the data in a line plot. Then find the range. PRE-ALGEBRA LESSON 12-1 “How many cases are you trying?” NumberFrequency 0 3 1 5 2 4 3 5 4 4 Frequency Tables, Line Plots, and Histograms 12-1

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(continued) PRE-ALGEBRA LESSON 12-1 The greatest value in the data set is 4 and the least value is 0. So the range is 4 – 0, or 4. For a line plot, follow these steps 1, 2, and 3. 3 Write a title that describes the data. Cases Tried by Judges 2 Mark an x for each response.x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 1 Draw a number line with the choices below it. 0123401234 Frequency Tables, Line Plots, and Histograms Quick Check 12-1

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PRE-ALGEBRA LESSON 12-1 Solve. 1.Maria surveyed friends to find out how many pets each one has. The responses are below. Display the data in a frequency table. 0, 1, 1, 2, 3, 0, 1, 1, 3, 2, 1, 2, 1, 0, 1, 0, 0 2.Here are the numbers of books students read in the last month: 5, 4, 0, 12, 4, 5, 4, 3, 10, 5, 12, 3, 5, 7, 3, 10, 5, 0, 6. Display the data in a line plot. Then find the range. PetsTallyFrequency 0IIII5 1IIII II7 2III3 3II2 range: 12 Frequency Tables, Line Plots, and Histograms 12-1

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Box-and-Whisker Plots PRE-ALGEBRA LESSON 12-2 (For help, go to Lesson 3-3.) Find each median. 1.12, 10, 11, 7, 9, 8, 10, 5 2.4.5, 3.2, 6.3, 5.2, 5, 4.8, 6, 3.9 3.55, 53, 67, 52, 50, 49, 51, 52, 52, 52 4.101, 100, 100, 105, 102, 101 Check Skills You’ll Need 12-2

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Box-and-Whisker Plots PRE-ALGEBRA LESSON 12-2 Solutions 1.5, 7, 8, 9, 10, 10, 11, 12 median = = 9.5 2.3.2, 3.9, 4.5, 4.8, 5, 5.2, 6, 6.3 median = = 4.9 3.49, 50, 51, 52, 52, 52, 52, 53, 55, 67 median = = 52 4.100, 100, 101, 101, 102, 105 median = = 101 9 + 10 2 4.8 + 5 2 52 + 52 2 101 + 101 2 12-2

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Box-and-Whisker Plots The data below represent the wingspans in centimeters of captured birds. Make a box-and-whisker plot. 61 35 61 22 33 29 40 62 21 49 72 75 28 21 54 PRE-ALGEBRA LESSON 12-2 Step 1 Arrange the data in order from least to greatest. Find the median. 21 21 22 28 29 33 35 40 49 54 61 61 62 72 75 Step 2 Find the lower quartile and upper quartile, which are the medians of the lower and upper halves. 21 21 22 28 29 33 35 40 49 54 61 61 62 72 75 lower quartile = 28 upper quartile = 61 12-2

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Step 3 Draw a number line. Mark the least and greatest values, the median, and the quartiles. Draw a box from the first to the third quartiles. Mark the median with a vertical segment. Draw whiskers from the box to the least and greatest values. Box-and-Whisker Plots PRE-ALGEBRA LESSON 12-2 (continued) Quick Check 12-2

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Draw a number line for both sets of data. Use the range of data points to choose a scale. Draw the second box-and-whisker plot below the first one. Box-and-Whisker Plots Use box-and-whisker plots to compare test scores from two math classes. PRE-ALGEBRA LESSON 12-2 Class A: 92, 84, 76, 68, 90, 67, 82, 71, 79, 85, 79 Class B: 78, 93, 81, 98, 69, 95, 74, 87, 81, 75, 83 Quick Check 12-2

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Box-and-Whisker Plots Describe the data in the box-and-whisker plot. PRE-ALGEBRA LESSON 12-2 The lowest score is 55 and the highest is 85. Half of the scores are at or between 66 and 80 and thus within 10 points of the median, 76. One fourth of the scores are at or below 66 and one fourth of the scores are at or above 80. Quick Check 12-2

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Box-and-Whisker Plots The plots below compare the percents of students who were eligible to those who participated in extracurricular activities in one school from 1992 to 2002. What conclusions can you draw? PRE-ALGEBRA LESSON 12-2 About 95% of the students were eligible to participate in extracurricular activities. Around 60% of the students did participate. A little less than two thirds of the eligible students participated in extracurricular activities. Quick Check 12-2

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Box-and-Whisker Plots PRE-ALGEBRA LESSON 12-2 Solve. 1.Use the data to make a box-and-whisker plot. Student heights (in.) are: 60, 66, 59, 67, 68, 63, 62, 61, 69, 64, 61. a. What is the median height? b. Between what heights do 50% of the students fall? 63 in. between 61 in. and 67 in. 12-2

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Box-and-Whisker Plots PRE-ALGEBRA LESSON 12-2 2.The box-and-whisker plots below compare prices for the same items at Mary’s Discount Store and Ed’s Clothing. What conclusions can you draw? Prices at the discount store are more tightly grouped around the median price of $25. Half the items cost from $18 to $45. For less expensive items, there is not much difference in the prices at the two stores. For more expensive items, the discount store offers lower prices. 12-2

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