In a mathematics test, 90 students obtained (out of 100) the marks given in the following table:

Marks

No. of students

1-20

8

21-40

12

41-50

15

51-60

20

61-70

13

71-80

17

81-90

05

Find the probability:

(i) a student obtained less than 41,
(ii) a student obtained more than 50,
(iii) a student obtained between 41 and 80.

Solution

Solution not provided.
Ans. $left parenthesis straight i right parenthesis space 2 over 9 space left parenthesis ii right parenthesis space 11 over 18 space left parenthesis iii right parenthesis space 13 over 18$

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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Introduction To Mathematical Modelling

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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Loaction

Marks	No. of students
1-20	8
21-40	12
41-50	15
51-60	20
61-70	13
71-80	17
81-90	05