Solution - Probability - an Experimental Approach



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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… 60 − 70, 70 − 100. Then she formed the following table:-

MarksNumber of students
0 - 207
20 - 3010
30 - 4010
40 - 5020
50 - 6020
60 - 7015
70 - above8
         Total                               90

(i) Find the probability that a student obtained less than 20 % in the mathematics test.

(ii) Find the probability that a student obtained marks 60 or above.


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Solution for concept: Probability - an Experimental Approach. For the course 8th-10th CBSE