1500 families with 2 children were released randomly and the following data was recorded:

No. of girls

No. of families

0

1

2

211

814

475

If a family is chosen at random, find the probability that it has

(i) at most one girl
(ii) at least one girl

Solution

Total number of families = 1500

(i) at most one girl means 0 girl or 1 girl.
∴ Number of families which have at most one girl
= 211 +814= 1015
∴Probability that it has at most one girl
$equals 1015 over 1500 equals 203 over 300$

(ii) at least one girl means 1 girls or 2 girls.

∴ Number of families which have at least one girl
= 814 + 475 = 1289
∴ Probability that it has at least one girl
$equals 1289 over 1500.$

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

1500 families with 2 children were released randomly and the following data was recorded:

No. of girls

No. of families

0

1

2

211

814

475

If a family is chosen at random, find the probability that it has

(i) at most one girl
(ii) at least one girl

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

For Daily Free Study Material Join wiredfaculty

Introduction To Mathematical Modelling

1500 families with 2 children were released randomly and the following data was recorded: No. of girls No. of families 0 1 2 211 814 475 If a family is chosen at random, find the probability that it has (i) at most one girl(ii) at least one girl

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

1500 families with 2 children were released randomly and the following data was recorded:

No. of girls

No. of families

0

1

2

211

814

475

If a family is chosen at random, find the probability that it has

(i) at most one girl
(ii) at least one girl