Lower Quartile. Quartiles are calculated differently for odd and even numbers of values. There are 11 values so we substitute 11 for n in the formula.
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Lower quartile middle value of the lower half 12. Quartile 1 q1 4 4 2 4. The lower quartile is the third term which is 6.
How to calculate quartiles order your data set from lowest to highest values.
The lowest value is 3 the highest value is 18. And the interquartile range is. The third quartile q 3 is the median of the upper half not including the value of q 2. That gives us 11 1 3.
