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The frequency distribution shows tha marks of 100 students in a Mathematics ...

The frequency distribution shows tha marks of 100 students in a Mathematics test.
Marks 1-10 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100
No. ofStudents 2 4 9 13 18 32 13 5 3 1



(a) Draw cumulative frequency curve for the distribution .
(b) Use your curve to estimate : (i) the median ; (ii) the lower quartile ; (iii) the 60th percentile.




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