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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Finish Test 15 minutes Wednesday February 8, 2012 Guided Practice pg. 379 #1-6 Homework pg. 379 #7-10 Warm Up page 373 #4-15 Jason deposits $200 in an account that earns 3.6% simple interest. How long until the total amount $300. Course 2 Almost 14 years

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Problem of the Day Books A, B, C, and D are on the bookshelf. A is between C and B. B is between A and D. D is not on the right. What is the order of the books from right to left? D, B, A, C Course 2

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Learn to organize and interpret data in frequency tables and stem-and-leaf plots, and line plots.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Vocabulary frequency table cumulative frequency stem-and-leaf plot line plot

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 A frequency table is a way to organize data into categories or groups. By including a cumulative frequency column in your table, you can keep a running total of the frequencies in each category.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the average high temperatures for 20 cities on one February day. Make a cumulative frequency table of the data. How many cities had average high temperature below 59 degrees? 69, 66, 65, 51, 50, 50, 44, 41, 38, 32, 32, 28, 20, 18, 12, 8, 8, 4, 2, 2 Additional Example 1: Organizing and Interpreting Data in a Frequency Table February Temperatures in 20 Cities Average Highs Frequency Cumulative Frequency Step 1: Look at the range to choose a scale that includes all of the data values. Then separate the scale into equal intervals. 0–19 20–39 40–59 60–79

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the average high temperatures for 20 cities on one February day. Make a cumulative frequency table of the data. How many cities had average high temperature below 59 degrees? 69, 66, 65, 51, 50, 50, 44, 41, 38, 32, 32, 28, 20, 18, 12, 8, 8, 4, 2, 2 Additional Example 1 Continued Step 2: Find the number of data values in each interval. Write these numbers in the Frequency column. February Temperatures in 20 Cities Average Highs Frequency Cumulative Frequency –19 20–39 40–59 60–79

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the average high temperatures for 20 cities on one February day. Make a cumulative frequency table of the data. How many cities had average high temperature below 59 degrees? 69, 66, 65, 51, 50, 50, 44, 41, 38, 32, 32, 28, 20, 18, 12, 8, 8, 4, 2, 2 Additional Example 1 Continued Step 3: Find the cumulative frequency for each row by adding all the frequency values that are above or in that row. February Temperatures in 20 Cities Average Highs Frequency Cumulative Frequency 0–19 20–39 40–59 60– cities had average high temperature below 59 degrees.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 1 English Exam Grades GradesFrequency Cumulative Frequency 60–69 70–79 80–89 90–99 Step 1: Choose a scale that includes all of the data values. Then separate the scale into equal intervals. The list shows the grades received on an English exam. Make a cumulative frequency table of the data. How many students received a grade of 79 or below? 85, 84, 77, 65, 99, 90, 80, 85, 95, 72, 60, 66, 94, 86, 79, 87, 68, 95, 71, 96

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the grades received on an English exam. Make a cumulative frequency table of the data. How many students received a grade of 79 or below? 85, 84, 77, 65, 99, 90, 80, 85, 95, 72, 60, 66, 94, 86, 79, 87, 68, 95, 71, 96 Check It Out: Example 1 Continued Step 2: Find the number of data values in each interval. Write these numbers in the Frequency column. English Exam Grades GradesFrequency Cumulative Frequency 60–69 70–79 80–89 90–

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the grades received on an English exam. Make a cumulative frequency table of the data. How many students received a grade of 79 or below? 85, 84, 77, 65, 99, 90, 80, 85, 95, 72, 60, 66, 94, 86, 79, 87, 68, 95, 71, 96 Step 3: Find the cumulative frequency for each row by adding all the frequency values that are above or in that row. English Exam Grades GradesFrequency Cumulative Frequency 60–69 70–79 80–89 90– students received grades of 79 or below. Check It Out: Example 1 Continued

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 A stem-and-leaf plot can be used to show how often data values occur and how they are distributed. Each leaf on the plot represents the right-hand digit in a data value, and each stem represents left-hand digits Stems Leaves Key: 2|7 means 27

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The data shows the number of years coached by the top 15 coaches in the all-time NFL coaching victories. Make a stem-and-leaf plot of the data. Then find the number of coaches who coached fewer than 25 years. 33, 40, 29, 33, 23, 22, 20, 21, 18, 23, 17, 15, 15, 12, 17 Additional Example 2: Organizing and Interpreting Data in a Stem-and-Leaf Plot Step 1: Order the data from least to greatest. Since the data values range from 12 to 40, use tens digits for the stems and ones digits for the leaves.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Additional Example 2 Continued Step 2: List the stems from least to greatest on the plot. Stems Leaves The stems are the tens digits. The data shows the number of years coached by the top 15 coaches in the all-time NFL coaching victories. Make a stem-and-leaf plot of the data. Then find the number of coaches who coached fewer than 25 years. 33, 40, 29, 33, 23, 22, 20, 21, 18, 23, 17, 15, 15, 12, 17

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Additional Example 2 Continued Step 3: List the leaves for each stem from least to greatest. Stems Leaves The stems are the tens digits The leaves are the ones digits. The data shows the number of years coached by the top 15 coaches in the all-time NFL coaching victories. Make a stem-and-leaf plot of the data. Then find the number of coaches who coached fewer than 25 years. 33, 40, 29, 33, 23, 22, 20, 21, 18, 23, 17, 15, 15, 12, 17

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Additional Example 2 Continued Step 4: Add a key and a title. The stems are the tens digits. Stems Leaves The leaves are the ones digits. Number of Years Coached Key: 2 | 1 means coaches coached fewer than 25 years.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The list shows the number of times each soccer player can bounce the ball on their knee. How many soccer players can bounce the ball more than 36 times. 55, 60, 33, 30, 23, 45, 28, 41, 62, 29, 35, 40, 43, 37, 68, 30, 61, 27, 38, 41 Check It Out: Example 2 Step 1: Order the data from least to greatest. Since the data values range from 23 to 68, use tens digits for the stems and ones digits for the leaves.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 2 Continued Step 2: List the stems from least to greatest on the plot. Stems Leaves The stems are the tens digits. The list shows the number of times each soccer player can bounce the ball on their knee. How many soccer players can bounce the ball more than 36 times. 55, 60, 33, 30, 23, 45, 28, 41, 62, 29, 35, 40, 43, 37, 68, 30, 61, 27, 38, 41

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 2 Continued The stems are the tens digits. Stems Leaves Step 3: List the leaves for each stem from least to greatest. The leaves are the ones digits The list shows the number of times each soccer player can bounce the ball on their knee. How many soccer players can bounce the ball more than 36 times. 55, 60, 33, 30, 23, 45, 28, 41, 62, 29, 35, 40, 43, 37, 68, 30, 61, 27, 38, 41

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 2 Continued The stems are the tens digits. Step 4: Add a key and a title. The leaves are the ones digits. Stems Leaves Number of times a Soccer Player can bounce the ball on their knee Key: 4 | 0 means soccer players can bounce the ball on their knee more than 36 times.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Make a line plot of the data. How many hours per day did Morgan babysit most often? Additional Example 3: Organizing and Interpreting Data in a Line Plot MTWThFSSu Wk Wk Wk Wk Number of Babysitting Hours in July

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Make a line plot of the data. How many hours per day did Morgan babysit most often? Additional Example 3 Continued Step 1: The data values range from 0 to 8. Draw a number line that includes this range

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Make a line plot of the data. How many hours per day did Morgan babysit most often? Additional Example 3 Continued Step 2: Put an X above the number on the number line that corresponds to the number of babysitting hours in July XXXXXXXX X XXXXXX X XXXXXX X XXXXXXXXXXXX XXXXXX XXXXXXXX The greatest number of Xs appear above the number 6. This means that Morgan babysat most often for 6 hours.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Make a line plot of the data. How many slices of pizza did most people eat? Check It Out: Additional Example Number of Slices eaten per Person

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 3 Continued Step 1: The data values range from 0 to 6. Draw a number line that includes this range Make a line plot of the data. How many slices of pizza did most people eat?

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Check It Out: Example 3 Continued Make a line plot of the data. How many slices of pizza did most people eat? Step 2: Put an X above the number on the number line that corresponds to the number slices of pizza eaten per person. X XXXXXX XXXXXXXXXXXX XXXXXX XXXXXXXX XXXXXX X The greatest number of Xs appear above the number 2. This means that most people ate 2 slices of pizza.

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 Lesson Quiz: Part I Nurses Ages AgesFrequency Cumulative Frequency 20– – – – – The data shows the ages of some hospital nurses. 33, 35, 23, 39, 23, 24, 34, 21, 57, 45, 57, 60, 45, 24, 31, 42, 61, 45, 35, Make a cumulative frequency table of the data. How many of the nurses are under the age of 40? 12

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The data shows the ages of some hospital nurses. 33, 35, 23, 39, 23, 24, 34, 21, 57, 45, 57, 60, 45, 24, 31, 42, 61, 45, 35, Make a stem-and-leaf plot of the data. How many nurses are over the age of 45? Stems Leaves Nurses Ages Key: 4 | 2 means Lesson Quiz: Part II

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7-1 Frequency Tables, Stem-and-Leaf Plots, and Line Plots Course 2 The data shows the ages of some hospital nurses. 33, 35, 23, 39, 23, 24, 34, 21, 57, 45, 57, 60, 45, 24, 31, 42, 61, 45, 35, Make a line plot of the data. What age occurs most often? XXXXXXXXXX XXXXXXXXXXXXXX XXXXXXXX X X Lesson Quiz: Part III

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