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Math Help - Problem related to probability.

  1. #1
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    Problem related to probability.

    Hi,

    Need assistance in below question.

    100 students appeared for two examinations. 60 passed the first, 50 passed the second and 30 passed the both.Find the probability that student selected at random has failed in both the examination?

    Thanks,
    Ashish
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Quote Originally Posted by a69356 View Post
    Hi,

    Need assistance in below question.

    100 students appeared for two examinations. 60 passed the first, 50 passed the second and 30 passed the both.Find the probability that student selected at random has failed in both the examination?

    Thanks,
    Ashish
    How many passed both---30

    How may passed ONLY 1st ----60-30 = 30

    " ' ' ' ' ONLY 2nd -----50-30 = 20

    Thus Total who passed any(or both) of them = 30 + 30 + 20 = 80

    So 100-80=20 passed neither

    Select one of 100 he should be one of these 20
    Hence Probability = 20/100 = 1/5


    Adarsh
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