Q3. 1500 families with 2 children were selected randomly, and the following data were
recorded:

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

 

Answers (1)

Sum of all probabilities =

Ptotal  =P(Family, chosen at random has 2 girls) +P(Family, chosen at random has 1 girl) + P(Family, chosen at random has no girl)

= 475/1500 + 814/1500 + 211/1500

= 1500/1500

=1

Must be the result we must get. 

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