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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    This table shows how long Naidu slept each night recently. The probability that tonight he will sleep for between 5 and 7 hours.
    Hours Slept Frequency
    \[5\le h<6\] 10
    \[6\le h<7\] 12
    \[7\le h<8\] 42
    \[8\le h<9\] 36

    A)  0.248              

    B)  0.224  

    C)  0.213              

    D)  0.220

    Correct Answer: D

    Solution :

    (d): Naidu slept between 5 to 7 hours (No. of days) \[=22=n\left( E \right)\] Total Days \[=100=n\left( E \right)\] \[n(P)=\frac{n(E)}{n(S)}=\frac{22}{100}=0.22\]


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