# Marks obtained by 90 students of Class IX in a test are given below:Out of these students one is chosen at random. Find the probability that the chosen student obtains(i) less than 20% marks (ii) 80% of more marks(iii) 60% or more marks

Total number of students : 90

Number of students who scored less than 20% : 8

Number of students who scored more than 80% : 9

Number of students who scored more than 60% : 35

Probability P() =

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

P(20) =

(ii) Let P(80) be probability of students who scored more than 80%

P(80) =

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

P(60) =

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