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Ncert solutions
Grade 9 
Mathematics
Ncert Solutions - Mathematics, Class 9
Probability
Probability - Exercise 15.1
Question 4
Mathematics
Ncert Solutions - Mathematics, Class 9
Probability
Probability - Exercise 15.1
Question 4
Probability | Probability - Exercise 15.1
Question 4
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:
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.
Question 4
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:
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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