1.

The marks obtained by 90 students of a school in mathematics out of 100 are given as under: Marks 0 – 20 20 – 30 30 – 40 40 – 50 50 – 60 60 – 70 70 and above Number of students 7 8 12 25 19 10 9 From these students, a student is chosen at random.What is the probability that the chosen student(i) gets 20% or less marks?(ii) gets 60% or more marks?

Answer»
The marks obtained by 90 students of a school in mathematics out of 100 are given as under:























Marks 0 – 20 20 – 30 30 – 40 40 – 50 50 – 60 60 – 70 70 and above
Number of students 7 8 12 25 19 10 9

From these students, a student is chosen at random.

What is the probability that the chosen student

(i) gets 20% or less marks?

(ii) gets 60% or more marks?


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