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Question 6 (ii)
A teacher wanted to analyze 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 student020720301030401040502050602060701570above8Total90
(ii) Find the probability that a student obtained marks 60 or above.

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Solution

Total number of students = 90
(ii) Number of students obtaining marks 60 or above = 15+8 = 23
Hence, required probability, P=2390

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