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Introduction To Mathematical Modelling

Question

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In a medical examination of students of a class, the following blood groups are recorded:

Blood group

No. of students

A

10

AB

13

B

12

O

5

A student is selected at random from the class. The probability that a student has blood group ‘B’ is:

$1 fourth$
$13 over 40$
$3 over 10$
$1 over 8$

Solution

C.

3 over 10

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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