Pre-Algebra 4-5 Displaying Data Warm Up Write each fraction as a decimal Pre-Algebra 4-5 Displaying Data

Pre-Algebra 4-5 Displaying Data Learn to display data in bar graphs, histograms, and line graphs.

Pre-Algebra 4-5 Displaying Data Vocabulary bar graph frequency table histogram line graph

Pre-Algebra 4-5 Displaying Data A bar graph is a good way to display data that can be grouped in categories. If the data is given in the form of a list, it may help to organize the data in a frequency table first

Pre-Algebra 4-5 Displaying Data Example 1: Displaying Data in a Bar Graph Organize the data into a frequency table and make a bar graph. The following data set reflects the number of hours of television watched every day by members of a sixth- grade class: First, organize the data into a frequency table.

Pre-Algebra 4-5 Displaying Data Hours of TV Watched Frequency Example 1 Continued Organize the data into a frequency table and make a bar graph

Pre-Algebra 4-5 Displaying Data Hours of TV Watched Frequency Organize the data into a frequency table and make a bar graph The frequency is the number of times each value occurs. Example 1 Continued

Pre-Algebra 4-5 Displaying Data Organize the data into a frequency table and make a bar graph. The frequencies are the heights of the bars in the bar graph. Example 1 Continued

Pre-Algebra 4-5 Displaying Data Example 2 Organize the data into a frequency table and make a bar graph. The following data set reflects the number of laptop computers that are repaired by Mike the technician in one week. (each number is one day) First, organize the data into a frequency table.

Pre-Algebra 4-5 Displaying Data Organize the data into a frequency table and make a bar graph Day of the WeekNumber of Repairs Monday3 Tuesday5 Wednesday7 Thursday8 Friday4 Example 2 Continued

Pre-Algebra 4-5 Displaying Data Organize the data into a frequency table and make a bar graph. Example 2 Continued Frequency of Lap Top Repairs Mon. Tue. Wed. Thu. Fri.

Pre-Algebra 4-5 Displaying Data Example 3: Displaying Data in a Histogram Jimmy surveyed 12 children to find out how much money they received from the tooth fairy. Use the data to make a histogram First, make a frequency table with intervals of $1.00. Then make a histogram.

Pre-Algebra 4-5 Displaying Data Example 3 Continued – – – – 0.99 FrequencyMoney ($)

Pre-Algebra 4-5 Displaying Data Example 3 Continued

Pre-Algebra 4-5 Displaying Data Example 4 Tonya surveyed 14 children at an after school day care to find out how many hours they spend there. Use the data to make a Histogram. 2:00 1:40 3:00 0:30 1:00 1:30 2:30 0:30 2:45 1:00 2:00 1:35 1:30 3:00 First, make a frequency table with intervals of 30 minutes. Then make a histogram.

Pre-Algebra 4-5 Displaying Data Time Spent at Day CareFrequency 0:00 to 0:302 0:31 to 1:002 1:01 to 1:302 1:31 to 2:004 2:01 to 2:301 2:31 to 3:003 2:00 1:40 3:00 0:30 1:00 1:30 2:30 0:30 2:45 1:00 2:00 1:35 1:30 3:00 Example 4 Continued

Pre-Algebra 4-5 Displaying Data Example 4 Continued Frequency Hours Spent at Day Care :00 to 0:30 0:31 to 1:00 1:01 to 1:30 1:31 to 2:00 2:01 to 2:30 2:31 to 3:00

Pre-Algebra 4-5 Displaying Data Example 5: Displaying Data in a Line Graph Make a line graph of the given data. Use the graph to estimate Mr. Yi’s salary in , , , , Salary ($)Year

Pre-Algebra 4-5 Displaying Data Example 5 Continued Create ordered pairs from the data in the table and plot them on a grid. Connect the points with lines. You can estimate the salary in 1992 by finding the point on the line between 1990 and 1995 that corresponds to Mr. Yi’s 1992 salary was about $51,000. Year Salary Mr. Yi’s Salary

Pre-Algebra 4-5 Displaying Data Example 6 Make a line graph of the given data. Use the graph to estimate the number of drivers licenses issued in Yea r Licenses (millions) ’ 80 ’ 85 ’ 90 ’ 95 ’ About 172 million Year Licenses (millions) Licenses Issued

Pre-Algebra 4-5 Displaying Data Lesson Review: Part 1 1. Organize the data in a frequency table and make a bar graph. 2, 4, 3, 1, 4, 1, 2, 2, 5, 1, 4, 3, 2, 1, 4, 3, 5, Frequency UnitsFrequency

Pre-Algebra 4-5 Displaying Data Lesson Review: Part 2 Use the graph for problems 2–4. 20 minutes Friday 2. What day did Sue exercise for 30 minutes? 3. How long did Sue exercise on Tuesday? 4. How many days did Sue exercise that week? 5