2) Following are the marks obtained by 120 students in ICSE Mathematics Paper
Marks 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 – 70 70 – 80
f 1 3 11 21 43 32 9
Represent the above data by means of an ogive and use it to find
(i)Median (ii)Upper Quartile (iii)Lower Quartile (iv) Inter- quartile range (v)% of students who are
getting more than 65 marks.
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