Medians, Quartiles and Box Plots

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Median drive 85 yards
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Median drive 90 yards
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Finding the median, quartiles and inter-quartile
range.
Example 1 Find the median and quartiles for the
data below.
12, 6, 4, 9, 8, 4, 9, 8,
5, 9, 8, 10
Order the data
4, 4, 5, 6, 8, 8, 8, 9,
9, 9, 10, 12
Inter-Quartile Range 9 - 5½ 3½
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Finding the median, quartiles and inter-quartile
range.
Example 2 Find the median and quartiles for the
data below.
6, 3, 9, 8, 4, 10, 8,
4, 15, 8, 10
Order the data
3, 4, 4, 6, 8, 8, 8, 9,
10, 10, 15,
Inter-Quartile Range 10 - 4 6
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The averages are similar but the measures of
spread are significantly different since the
extreme values of 2 and 15 are not included in
the inter-quartile range.
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Box Plots
Lower Quartile
Upper Quartile
Lowest Value
Highest Value
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Worksheet 1
worksheet
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Worksheet 2
worksheet
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