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Question 6 (i)
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
(i) Find the probability that a student obtained less than 20% in the mathematics
test.

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Solution

Total number of students = 90
(i) Number of students getting less than 20 % marks in the test = 7
Hence, required probability, P=790

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