2-13. (a) The following table gives the frequency distribution of marks in a class of 65 students: Marks No. of Students Marks No. of students 0-4 10 14-18 4-8 12 18-20 3 8-12 18 20-25 12-14 7. 25 and over Total 65 Calculate : (i) Upper and lower quartiles. (ii) Number of students who secured marks more than 17. (ii) Aumhan of utu ueen 10 and 15

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