Ncert solutions
Our top 5% students will be awarded a special scholarship to Lido.

Probability | Probability - Exercise 15.1

Question 3

1500 families with 2 children were selected randomly, and the following data were recorded:

Compute the probability of a family, chosen at random, having No girl

Also, check whether the sum of these probabilities is 1.

Looking to do well in your science exam ?  
Learn from an expert tutor. Book a free class!

ANSWER:

Total numbers of families = 1500

Numbers of families having 2 girls = 211

Probability = Numbers of families having 0 girls/Total numbers of families

=\frac{211}{1500}

Sum of the probability = \frac{19}{60}+\frac{407}{750}+\frac{211}{1500}

=\frac{407+814+211}{1500}

=\frac{1500}{1500}

=1

Yes, the sum of these probabilities is 1.

Set your child up for success with Lido, book a class today!

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta

Question 3

1500 families with 2 children were selected randomly, and the following data were recorded:

Compute the probability of a family, chosen at random, having No girl

Also, check whether the sum of these probabilities is 1.

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

ANSWER:

Total numbers of families = 1500

Numbers of families having 2 girls = 211

Probability = Numbers of families having 0 girls/Total numbers of families

=\frac{211}{1500}

Sum of the probability = \frac{19}{60}+\frac{407}{750}+\frac{211}{1500}

=\frac{407+814+211}{1500}

=\frac{1500}{1500}

=1

Yes, the sum of these probabilities is 1.

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
Connect with us on social media!
2021 © Quality Tutorials Pvt Ltd All rights reserved
`