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Introduction To Mathematical Modelling

Question

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Marks obtained by 500 students in a test of 100 marks are tabulated as below:

Marks obtained

No. of students

0–25

58

25-50

122

50-75

165

75-100

155

If a student is selected at random, the probability that he obtains less than 50% marks is:

$69 over 100$
$9 over 25$
$33 over 100$
$61 over 250$

Solution

B.

9 over 25

Some More Questions From Introduction to Mathematical Modelling Chapter

Activity: Note the frequency of two wheelers, three wheelers and four wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is a two-wheeler.

Activity: Ask all the students in your class to write a 3-digit number. Choose any student from the room at random. What is the probability that the number written by her/him is divisible by 3 ? Remember that a number is divisible by 3, if the sum of its digits is divisible by 3.

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