Ms. Drake 7th grade Math Measures of Central Tendency Lesson 7 Box and Whisker Plots.

Ms. Drake 7th grade Math

Measures of Central Tendency

Lesson 7

Box and Whisker Plots

Measures of Central Tendency Vocabulary

Measures of Central Tendency Vocabulary

Measures of Central Tendency Vocabulary

Measures of Central Tendency Vocabulary

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.

Box and Whisker Plot

Constructing a Box and Whisker Plot

Step 1: Find the lower and upper extremes , the

median, and the first and third quartiles

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

Identify the Lower and Upper Extremes

120, 128, 131, 136, 142, 158, 167

Find the medianand the

first and third quartile

Find the First and Third Quartile

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

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.

Make the box, mark the median,

draw the whiskers.

Use this data to construct a box and whiskers plot

Median: 11Lower Quartile: 7Upper Quartile: 13Lower Extreme: 1

Upper Extreme: 21

Median: 11, Lower Quartile: 7Upper Quartile: 13, Lower

Extreme: 1Upper Extreme: 21

Until next time…

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25%

60-20

Resources

http://mathlearnnc.sharpschool.com/cms/One.aspx?portalId=4507283&pageId=5149151