9th Class Mathematics Probability Question Bank Probability

  • question_answer 1500 families with 2 children were selected randomly and the following data were recorded. What is the possibility of a family chosen at random having at least 1 girl.
    Number of girls in a family 2 1 0
    Number of families 475 825 200

    A) \[\frac{11}{15}\]                       

    B)  \[\frac{11}{15}\]            

    C)  \[\frac{2}{15}\]                                    

    D)  \[\frac{13}{15}\]

    Correct Answer: D

    Solution :

    (d): No. of families who have at least one girl \[=1300=n\left( E \right)\] Total families = 1500 \[n(p)=\frac{1300}{1500}=\frac{13}{15}\]

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