Question

Following table shows the marks scored by a group of 90 students in a mathematics test of 100 marks.

Marks 0-20 20-30 30-40 40-50 50-60 60-70 70-100

No. of students 7 10 10 20 20 15 8

Find the probability that a student obtained: (i) less than 20% marks (ii) 60 or more marks​

Answer 1

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Answer 2

Answer:

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