How much should an average electric bill cost with heat paid?

I am moving into a 1-bedroom apartment soon in Jamestown, ND. It is nothing big, but it does have very high ceilings. The heat is paid by the owner of the building. I am just wondering how much an average electric bill will be a month? I always shut off all the lights when I leave and also do not keep the in-window air conditioner on when I am gone. I will only need the air conditioner for about 3 months out of the year.