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Question

250 students of class X of a school appeared in a test of 100 marks and the data about the marks secured is as below.Markssecured02021404160618081100Numberofstudents2035656070

Find the probability of selecting at random, a student who scored

(i) not more than 40
(ii) more than 60
(iii) more than 80 [ 2 MARKS ]

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Solution

Concept: 1.5 Marks
Solution: 0.5 Marks each




Number of students who didn’t score more than 40 = 20 + 35 = 55
Probability that a student didn’t score more than 40 = 55250 = 0.22.
Number of students who scored more than 60 = 60 + 70 = 130
Probability that a student scored more than 60 = 130250 = 0.52.
Number of students who scored more than 80 = 70
Probability that a student scored more than 80 = 70250 = 0.28.


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