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Introduction To Mathematical Modelling

Question

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A and B are the only two outcomes of an event. Probability P(A) = 0.72 then what will be the probability P(B) and why?

Solution

P(A) + P(B) = 1
[ $because$ Sum of the probablities of all the outcomes of an event is 1]
$rightwards double arrow space space space space space space 0.72 space plus space straight P left parenthesis straight B right parenthesis space equals space 1 rightwards double arrow space space space space space straight P left parenthesis straight B right parenthesis space equals space 1 minus 0.72 equals 0.28$

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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