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Ncert solutions

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

Compute the probability of a family, chosen at random, having 2 girls.

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

ANSWER:

Total numbers of families = 1500

Numbers of families having 2 girls = 475

Probability = Numbers of families having 2 girls/Total number of families

=\frac{475}{1500}

=\frac{19}{60}

**Yes, the sum of these probabilities is 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 2 girls.

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

ANSWER:

Total numbers of families = 1500

Numbers of families having 2 girls = 475

Probability = Numbers of families having 2 girls/Total number of families

=\frac{475}{1500}

=\frac{19}{60}

**Yes, the sum of these probabilities is 1.**

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