1500 families with 2 children were selected -Maths 9th

1500 families with 2 children were selected -Maths 9th
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(i) P (a family having 2 girls) = Number of families having 2 girls/Total number of families = 475/1500 = 19/60 (ii) P (a family having 1 girl) = Number of families having 1 girl/Total number of families =  814/1500 = 407/750 (iii) P (a family having no girl) = Number of families having no girl/Total number of families =  211/1500  Sum of probabilities = 475/1500 +  814/1500 + 211/1500 = 1500/1500 = 1
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