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Published byEric Holt Modified over 7 years ago

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continued… Obj: draw Box-and-whisker plots representing a set of data Do now: use your calculator to find the mean for 85, 18, 87, 100, 27, 34, 93, 52, 91, 54, 59, 61, 82, 68, 78

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Step 1 - Find the median. 18, 27, 34, 52, 54, 59, 61, 68, 78, 82, 85, 87, 91, 93, 100 68 is the median of this data set. Step 2 – Find the lower quartile. *The lower quartile is the median of the data set to the left of 68. (18, 27, 34, 52, 54, 59, 61,) 68, 78, 82, 85, 87, 91, 93, 100 52 is the lower quartile

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Step 3 – Find the upper quartile. *The upper quartile is the median of the data set to the right of 68. 18, 27, 34, 52, 54, 59, 61, 68, (78, 82, 85, 87, 91, 93, 100) 87 is the upper quartile Step 4 – Find the maximum and minimum 18, 27, 34, 52, 54, 59, 61, 68, 78, 82, 85, 87, 91, 93, 100 18 is the minimum and 100 is the maximum.

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In order to draw the box-and-whisker plot, Organize the 5 number summary Min – 18 Lower Quartile – 52 Median – 68 Upper Quartile – 87 Max – 100

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Notice, the Box includes the lower quartile, median, and upper quartile. The Whiskers extend from the Box to the max and min.

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Ex 4: Use the following set of data to create the 5 number summary and a box-and-whisker plot. 3, 7, 11, 11, 15, 21, 23, 39, 41, 45, 50, 61, 87, 99, 220

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Median 3, 7, 11, 11, 15, 21, 23, 39, 41, 45, 50, 61, 87, 99, 220 The median is 39

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Lower Quartile ( 1 st Quartile ) (3, 7, 11, 11, 15, 21, 23), 39, 41, 45, 50, 61, 87, 99, 220 The lower quartile is 11

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Upper Quartile ( 3rd Quartile ) 3, 7, 11, 11, 15, 21, 23, 39, (41, 45, 50, 61, 87, 99, 220) The upper quartile is 61

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Maximum 3, 7, 11, 11, 15, 21, 23, 39, 41, 45, 50, 61, 87, 99, 220 The max is 220

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Minimum 3, 7, 11, 11, 15, 21, 23, 39, 41, 45, 50, 61, 87, 99, 220 The min is 3

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Min - 3 Lower Quartile - 11 Median - 39 Upper Quartile - 61 Max - 220

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