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:

Question 4 Image - NCERT Mathematics Solutions - Class 9 chapter Probability

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

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


Probability denotes the possibility of something happening. It's a field of mathematics that studies the probability of a random event occurring. From 0 to 1, the value is expressed. Probability is a mathematical concept that predicts how likely occurrences are to occur. The definition of probability is the degree to which something is likely to occur.


Numbers of families having 1 girls = 814

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



Yes, the sum of these probabilities is 1.

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