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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    100 people arriving at the beach are asked their age. The results are shown alongside. Assuming that they give honest replies. What is the possibility that a randomly selected person on the beach will be aged between 30 or more?
    Age Frequency
    0-9 25
    10-19 17
    20-29 31
    30-39 20
    40 7

    A) 0.273                           

    B)  0.270      

    C)  0.271                          

    D)  0.272

    Correct Answer: B

    Solution :

    (b): No. of person aged 30 or more \[=27=n\left( E \right)\] Total\[=100=n\left( S \right)\] \[n(P)=\frac{n(E)}{n(S)}=\frac{27}{100}=0.27\]    


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