Emergency Room Data Hospital A Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec EP 934 961 1031 866 1129 1168 1275 1279 1083 1095 961 1221 AD

I have an assignment to create a histogram with 5 bars. I know basically how to do this but the problem is that I have 3 sets of data with 3 subgroups (attached.) I don't know how to set this up. HELP! (I am supposed to use I, J, and K for my data set.