The first and third quartiles of the following data are given to be 25 marks and 50 marks respectively out of the data given below: hline Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 hline Frequ- encies 4 8 - 19 - 10 5 - hline Find the missing frequencies when N=72. 15.
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