UNIT 3 HELP !

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so i've got my unit 3 coming up on 7th of may 2013. i've been practicing past papers and figured out that there are few things not understood by me. firstly please guide on how to mark standard deviation on the graph ( for reference question, go through unit 3 question paper for may and jan 2012 session). Secondly, while drawing a bar graph, are we supposed to draw joined bars or separate ? URGENTLY HELP PLEASE... !!!!!!!

Posted Sun 5th May, 2013 @ 00:30 by soha