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Introduction To Mathematical Modelling

Question

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Reena dialed a phone number 100 times in a week out of which she gets the response 55 times. The probability that she will not get the response is:
$55 over 100$
$100 over 55$
$45 over 100$
$100 over 45$

Solution

C.

45 over 100

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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