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7th Grade Math / Lesson 3: Box and Whisker Plots

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Box and Whisker Plot


Let's look at what we have 42, 43,44, 45, 47, 48, 49, 50, 50.5, 51, 54 lower median upper quartile quartile Now let's do steps 6, 7, 8 6. Draw a number line appropriate for the range of values. Label all of the middle numbers that we found. 
7. Draw boxes above the number line from the quartiles to the median. 8. Draw the whiskers from the quartiles to the end values. 
Those 8 steps will help you draw a box and whisker plot. And remember Each section of the box and whisker plot contains an EQUAL NUMBER OF DATA values, regardless of how big or small each section is. The longer the section is will only tell us that the data values are more spread out compared to the data values in the smaller sections. 
Answer the following questions 1. What is the median? 2. What is the lower quartile? 3. What is the upper quartile? 4. What is the range? 5. There are more data values above 40 than there are from 20 to 25. 
Answer the following questions 1. What is the median? 25 2. What is the lower quartile? 20 3. What is the upper quartile? 40 4. What is the range? 50 5. There are more data values above 40 than there are from 20 to 25. No, all sections contain the same number of data values regardless of the size of the section. 