Originally Posted by
juliak 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.