Ms. Drake 7th grade Math Measures of Central Tendency Lesson 7 Box and Whisker Plots.
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Transcript of Ms. Drake 7th grade Math Measures of Central Tendency Lesson 7 Box and Whisker Plots.
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Ms. Drake 7th grade Math
Measures of Central Tendency
Lesson 7
Box and Whisker Plots
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Measures of Central Tendency Vocabulary
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Measures of Central Tendency Vocabulary
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Measures of Central Tendency Vocabulary
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Measures of Central Tendency Vocabulary
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Box and Whisker Plot
A box and whisker plot is a graph that displays the
highest and lowest quarters of data as whiskers, the
middle two quarters of the data and the median.
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Box and Whisker Plot
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Constructing a Box and Whisker Plot
Step 1: Find the lower and upper extremes , the
median, and the first and third quartiles
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Lets try it…
This data
tells the distance it takes for cars to stop at a red
light.
Vehicle Stopping Distance (ft)
A 120B 158C 142D 131E 128F 167G 136
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Identify the Lower and Upper Extremes
120, 128, 131, 136, 142, 158, 167
Find the medianand the
first and third quartile
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Find the First and Third Quartile
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Constructing a Box and Whisker Plot
Step 2: Draw a number line. Above the number line plot points representing the lower and upper
extremes, the median and the first and third quartiles
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Constructing a Box and Whisker Plot
Step 3: Draw a box through the first and third quartiles.
Inside the box, draw a vertical line through the median. Then draw lines from the first and third
quartiles to the extremes. These lines are called the
whiskers.
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Make the box, mark the median,
draw the whiskers.
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Use this data to construct a box and whiskers plot
Median: 11Lower Quartile: 7Upper Quartile: 13Lower Extreme: 1
Upper Extreme: 21
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Median: 11, Lower Quartile: 7Upper Quartile: 13, Lower
Extreme: 1Upper Extreme: 21
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Until next time…
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10275%8850%
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25%
60-20
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Resources
http://mathlearnnc.sharpschool.com/cms/One.aspx?portalId=4507283&pageId=5149151