Marks (out of 100)

Number of students

0-20

7

20-30

10

30-40

10

40-50

20

50-60

20

60-70

15

70–above

8

Total

90

(i) Find the probability that a student obtained less than 20% in the mathematics test.
(ii) Find the probability that a student obtained marks 60 or above.

Solution

Total number of students = 90

(i) Number of students obtaining less than 20% in the mathematics test = 7
∴ Probability that a student obtained less than 20% in mathematics test = $7 over 90.$
(ii) Number of students obtaining marks 60 or above = 15 + 8 = 23
Probability that a student obtained marks 60 or = $23 over 90.$

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.

For Daily Free Study Material Join wiredfaculty

Introduction To Mathematical Modelling

Marks (out of 100)

Number of students

0-20

7

20-30

10

30-40

10

40-50

20

50-60

20

60-70

15

70–above

8

Total

90

(i) Find the probability that a student obtained less than 20% in the mathematics test.
(ii) Find the probability that a student obtained marks 60 or above.

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.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Loaction

Marks (out of 100)	Number of students
0-20	7
20-30	10
30-40	10
40-50	20
50-60	20
60-70	15
70–above	8
Total	90

For Daily Free Study Material Join wiredfaculty

Introduction To Mathematical Modelling

Marks (out of 100) Number of students 0-20 7 20-30 10 30-40 10 40-50 20 50-60 20 60-70 15 70–above 8 Total 90 (i) Find the probability that a student obtained less than 20% in the mathematics test.(ii) Find the probability that a student obtained marks 60 or above.

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.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Marks (out of 100)

Number of students

0-20

7

20-30

10

30-40

10

40-50

20

50-60

20

60-70

15

70–above

8

Total

90

(i) Find the probability that a student obtained less than 20% in the mathematics test.
(ii) Find the probability that a student obtained marks 60 or above.