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The percentage of marks obtained by a ...

The percentage of marks obtained by a student in the monthly unit tests are given below: `U n i t\ t e s t :` `I` `I I` `I I I` `I V` `V` `P e r c e n t ag e\ of\ m a r k s\ ob t a i n e d :` `58` `74` `76` `62` `85` Find the probability that the student gets: (i) a first class i.e. at least 60% marks (ii) marks between 70% and 80% (iii) a distinction i.e. 75% or above (iv) less than 65% marks.

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