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Question

400 students of class X of a school appeared in a test of 100 marks in the subject of social
studies and the data about the marks secured is as below :

Marks
secured
Number of
Students
025 50
2650 220
5175 100
Above 75 30
Total number of students 400

If the result card of a student he picked up at random, what is the probability that the student has secured more than 50 marks.


A
0.586
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B
0.75
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C
0.325
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D
0.1
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Solution

The correct option is B 0.325
Total number of students, i.e , the total frequency =400
The total number of students who secured more than 50 marks 100+30=130
Probability that the marks secured are more than 50= 130400 = 1.34 = 0.325

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