Answer :

Total number of students : 90


Number of students who scored less than 20% : 7


Number of students who scored more than 60% : 19


Probability P() =


(i) Let P(20) be probability of students who scored less than 20%


P(20) = =


(ii) Let P(60) be probability of students who scored more than 60%


P(60) = =


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