another thing, that cumulative freq. + boxplot question. the total of people was 40 afaik, so first of all to find the median i figured you divided /2 which =20, but then you add .5 on because it's a whole number or smth? anyway then i thought to my revision book which didn't say to do this. i've looked on the net, some sites are saying it's the exact middle value (ie 20 not 20.5) but a couple are saying that you do move it up .5. i'm confused, cos my book does say after checking that with an example of a cum freq graph, a max of 120 means the median is taken exactly at 60 (so not 60.5 then!¬).