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Introduction To Mathematical Modelling

Question

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The following table gives the distribution of IQ (intelligence quotient) of 60 pupils of class IX in a school:

IQ

No. of pupils

60–70

2

70–80

3

80-90

5

90-100

16

100–110

14

110-120

13

120-130

7

Find the probability that a student of class IX selected at random has IQ in the interval 80-90.

$1 over 12$
$1 over 8$
$1 over 10$
$1 fifth$

Solution

A.

1 over 12

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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