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Of the students in a college, it is know...

Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel) . Previous years results report that 30% of all students who reside in hostel attain A grade and 20% of day scholrs attain A grade in their annual examination . At the end of the year, one student is chosen at random from the college and he has an A grade, what is the probability that the student is a hostler ?

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The correct Answer is:
` = (9)/(13)`
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Knowledge Check

  • In a college of 30 students fail in physics, 25 fail in mathematics and 10 fail in both. One student is chosen at random. The probability that she fails in physics, if she has failed in mathematics is

    A
    1/10
    B
    2/5
    C
    9/20
    D
    1/3

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