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10th Class Mathematics Probability Question Bank MCQs - Probability

  • question_answer
    There are 1000 sealed envelopes in a box, 10 of them contain a cash prize of Rs 100 each, 100 of them contain a cash prize of Rs 50 each and 200 of them contain a cash prize of Rs 10 each and rest do not contain any cash prize. If they are well-shuffled and an envelope is picked up out, then the probability that is contains no cash prize is

    A) 0.65

    B) 0.69

    C) 0.54

    D) 0.57

    Correct Answer: B

    Solution :

    Total number of envelopes in the box =1000 Number of envelopes containing cash prize =10+100+200=310 Number of envelopes containing no cash prize = 1000 - 310 = 690 \[\therefore \]Required probability \[=\frac{690}{1000}=0.69\]


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