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10 cards from this deck
Range = largest value - smallest value
Q₁ position = (12+1)/4 = 3.25, find between 3rd & 4th
IQR = Q₃ - Q₁, shows middle 50% of data spread
Q₃ position = 3(20+1)/4 = 15.75, find between 15th & 16th
Order your data from smallest to largest
It only considers extreme values, ignoring others
Use cumulative frequency to locate quartile positions
It shows the total number of observations up to each value.
Not ordering data first before calculations
Q₂ is the median, dividing data into two equal halves
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