probabilty

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In a school, 14% of students take drama and computer classes, and 67% take drama Class. What is the probabilty that a students takes computer class given that the student takes drama class? i have no idea how to work this so please show me your work. Thanks!!

  • probabilty -

    This is a problem in "conditional probability".

    The probability of E, given F is:
    P(E/F) = P (E and F)/ P(F)

    Call P(F) = drama = .67 given
    Call P(E) = Computer = unknown
    the P(EandF) =.14 given
    Now the probability that a student takes computer given drama
    = .14/.67 = .21

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