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Using a fence to find Outliers

Interactive practice questions

Consider the dot plot below.


Determine the median, lower quartile score and the upper quartile score.

Median $=$= $\editable{}$

Lower quartile $=$= $\editable{}$

Upper quartile $=$= $\editable{}$


Hence, calculate the interquartile range.


Calculate $1.5\times IQR$1.5×IQR, where IQR is the interquartile range.


An outlier is a score that is more than $1.5\times IQR$1.5×IQR above or below the Upper Quartile or Lower Quartile respectively. State the outlier.

Approx 3 minutes
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