$400$ 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
$0 - 25$ $50$
$26 - 50$ $220$
$51 - 75$ $100$
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.

0.586

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0.75

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0.325

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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 $50 =$ $\frac{130}{400}$ = $\frac{1.3}{4}$ = $0.325$

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Q. Out of 10 student,who appeared in a test,three secured less than 30 marks and 3 secured more than 75 marks.The marks secured by the remaining 4 students are 35, 48, 66 and 40.Find the median score of the whole group.

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Marks secured	Number of Students
$0 - 25$	$50$
$26 - 50$	$220$
$51 - 75$	$100$
Above $75$	$30$
Total number of students	$400$

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

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 $50 =$ $\frac{130}{400}$ = $\frac{1.3}{4}$ = $0.325$