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2. 1000 families with 2 children were selected randomly, and the following data were recorded:
Class 10 | Frank | ICSE | Maths | Probability
2. 1000 families with 2 children were selected randomly, and the following data were recorded:
Number of girls in a family012
Number of families333392275

Find the probability of a family, having

(i) 1 girl (ii) 2 girls

Solution:-

Probability is the branch mathematics concerning numerical description of how likely an event is to occur, or how likely it is that a proposition is true.

In the question it is given that, total number of families = 1000

i.      Number of families that having 1 girl = 392

Then, required probability = Number of families that having 1 girl

                                                 /total number of families

= \frac{392}{1000}

= \frac{49}{125}      

= 0.49

ii.       Number of families that having 2 girls = 275

Then, required probability = Number of families that having 2girls

                                                 /total number of families

= \frac{275}{1000}

= \frac{11}{40}

= 0.275

i

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