Marks obtained by 2500 students are shown in the following table. A student is selected at random. Find the probability that:
(i) He scores more than 80% marks.
(ii) He scores less than 60%marks.
(iii) He scores more than or equal to 40 but less than 80
Class Interval Less than 40 40 - 60 60 - 80 80 -100
Frequency 610 840 750

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