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LQ = (U2 + U3)/2

and

UQ = (U6 + U7)/2

where Un is the nthnumber in the ordered setwill be sufficiently accurate.


If you want greater accuracy, you could go for

Lower quartile = U2 + 0.25*(U3-U2)Upper quartile = U6 + 0.75*(U7-U6)


But, to be honest, if you want accurate results you need more than 8 observations!


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Q: How do you find the upper and lower quartiles of 8 numbers?
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