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you do work out the upper and lower quartile
25% of the observed values are smaller than the lower quartile.
No, interquartile range cannot be for any data. The lower quartile for data must be used below the lower quartile.
lower quartile = 1/4(n+1) upper quartile = 3/4(n+1) where n is the number of the values. Obviously the values have to be ordered from the lower to the higher: the number you'll get is the position in this order. Let's say you get 4 for your lower quartile, it means that the 4th value is your lower quartile.
It is the upper quartile minus the lower quartile.