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Question

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

Number of girls in a family210Number of families300500700

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


  1. 1/3

  2. 1/5

  3. 7/15

  4. 8/15


Solution

The correct option is B

1/5


The total number of families = 300+500+700 = 1500

The families which have two girls = 300

P(Number of families having two girls) = Number of favourable outcomesTotal number of possible outcomes

                                                              =3001500 =15

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