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STATISTICS (DISPLAYING DATA) A graph is a visual representation of data that displays the more relationship among the variables. Graphs can present data clearly and concisely than a table or written text. Data can be numerical or categorical (types). continuous data: data that can have any numerical value within a finite or infinite interval ex. discrete data: data that are distinct and can be counted ex. A histogram or line graph may be used to display continuous data. A bar graph or circle graph may be used to represent discrete data. Unit 8 Lesson 3 Page 1 of 2 Example 1: 26 70 a) 63 43 A math class had the following grades on a test out of 100: 73 92 82 64 32 75 73 46 35 64 63 23 56 67 87 52 40 28 51 76 55 56 Starting with the interval 20–29, 30–39, etc., create a frequency table. Grades 20 – 29 30 – 39 40 – 49 50 – 59 60 – 69 70 – 79 80 – 89 90 – 100 Tally Frequency b) Use the frequency table to create a histogram. c) State which interval has the greatest frequency. d) Determine what percentage of the class received an “A” (80% or higher). Homework: p.125–128 #1–6, 11 Unit 8 Lesson 3 Page 2 of 2