Popping bars in Bar graph based on Filter selection

Thanks Sam for your reply.

I have gone through the shared link.

Here the requirements are little different. I want a LINE should always appear showing the Statewide Average. And then we make multiple selection in the HospitalID filter (Kindle refer to the image in the Original post) then bars (based on number of selections made)should appear representing that Hospital IDs.

So the final visual should be a Combo chart, which have a Line(always there) and Bars which represents Hospital ID ,selected in the multiselect filter. 

Please advise.

Thanks.