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Math Help - What means to implement in solving a probability question

  1. #1
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    What means to implement in solving a probability question

    In a certain class of 30 primary school children there are 16 girls. There are 7 girls and 6 boys with fair hair. A pupil is selected at random to be a class captain. Find the probability that the class captain is
    a) a girl whose hair is not fair
    b) a boy with fair hair
    c) has not ogt fair hair
    d) is a girland has not fair hair

    I'm not sure how to solve this because it seems as though the tree diagram and the venn diagram are not applicable?
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  2. #2
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    Quote Originally Posted by juliak View Post
    In a certain class of 30 primary school children there are 16 girls. There are 7 girls and 6 boys with fair hair. A pupil is selected at random to be a class captain. Find the probability that the class captain is
    a) a girl whose hair is not fair
    b) a boy with fair hair
    c) has not ogt fair hair
    d) is a girland has not fair hair

    I'm not sure how to solve this because it seems as though the tree diagram and the venn diagram are not applicable?
    Draw a 3x3 table, labelling the columns with 'fair hair' , 'no fair hair' and 'total' ,
    the row with 'boys' , 'girls' and 'total'. Fill up the figures appropriately. Then everything should follow from here.
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