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Introduction To Mathematical Modelling

Question

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The following distribution gives the times taken by 25 students to solve a problem:

Time (in seconds)

Number of students

15-20

2

20-25

3

25-30

7

30-35

6

35–40

4

40-45

2

45-50

1

Find the probability that the time taken by a student to solve the problem lies in the interval 35–40 or 45–50.

$1 half space$
$1 third$
$1 fourth$
$1 fifth$

Solution

D.

1 fifth

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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