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A teacher wanted to analyse the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows: $0-20,20-30, \ldots, 60-70$, 70 - 100. Then she formed the following table. Find the probability that a student obtained less than 20% in the mathematics test.
Answers (1)
From the above question, the data of our interest is:
Total no. of students =90
Total no. of students who obtained less than 20% in the mathematics test= 7
P(student obtained less than 20% in the mathematics test) = 7/90
Ans: 7/90
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