NCERT Solutions Class 9 Mathematics Solutions for Probability - Exercise 15.1 in Chapter 15 - Probability

Question 4 Probability - Exercise 15.1

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

Compute the probability of a family, chosen at random, having 1 girl

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

Answer:

ANSWER:

Numbers of families having 1 girls = 814

Probability = Numbers of families having 1 girls/Total numbers of families

= $\frac{814}{1500}$

= $\frac{407}{750}$

Yes, the sum of these probabilities is 1.

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Exercises

Probability - Exercise 15.1

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Number System

Polynomials

Coordinate Geometry

Linear Equations in Two Variables

Introduction to Euclids Geometry

Lines and Angles

Triangles

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Areas of Parallelograms and Triangles

Circles

Constructions

Heron’s Formula

Surface Areas and Volumes

Statistics

Probability