Quartiles have nothing to be "solved", but they can be "found" if that's what you mean...
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Roughly speaking, finding the third quartile is similar to finding the median. First, use the median to split the data set into two equal halves. Then the third quartile is the median of the upper half. Similarly, the first quartile is the median of the lower half.
If the result is 1.5 x Inter Quartile Range (or more) above the Upper Quartile or 1.5 x Inter Quartile Range (or more) below the Lower Quartile.
values that divide a list of numbers into quaters is called a quartile.
you do work out the upper and lower quartile
It is the upper quartile minus the lower quartile.