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Then count the given values. If it is odd, then the center value is median otherwise obtain the mean value for two center values. This is known as Q2value.If there are even number of values, the median will be the average of the middle two values. ...
Q2= [(n+1)/2]th item Q3= [3(n+1)/4]th item Hence, the formula for quartile can be given by; Where, Qr is the rthquartile l1is the lower limit l2is the upper limit f is the frequency c is the cumulative frequency of the class preceding the quartile class. ...