S1 Probability June 2005Watch
A student is chosen at random.
Find the probability that this student
(a) is studying Arts subjects,
(b) does not wear glasses, given that the student is studying Arts subjects.
Amongst the Science students, 80% are right-handed. Corresponding percentages for Humanities and Arts students are 75% and 70% respectively.
A student is again chosen at random.
(c) Find the probability that this student is right-handed.
(d) Given that this student is right-handed, find the probability that the student is studying Science subjects.
I've had a look at the mark scheme and I understood it, however, how would i know that drawing a sample space diagram (I think thats what its called?), is better than a tree diagram. Originally I started off with a tree diagram but it got confusing