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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    Robert recorded the length of TV commercial in seconds. His results are summarized in the table. The possibility that a randomly chosen TV commercial will show between 20 seconds and a minute.
    Length Frequency
    \[0\le t<20\] 17
    \[20\le t<40\] 38
    \[40\le t<60\] 19
    \[t\ge 60\] 4

    A)  0.137                          

    B)  0.317           

    C)  0.731

    D)  0.371

    Correct Answer: C

    Solution :

    (c): TV commercial show between 20 seconds and 1 minute = 57 times Total = 78 \[n\left( P \right)=\frac{57}{78}=0.731\]                         


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