Your bill is on the high side. It is because of the following.
Everything is electric.
Water and house heating with electric is costly. It take allot of energy to heat water and the same is true for electric heat.
Your fridge if it is old will also consume a large portion of the bill. Any unit older than 1993 consumes allot of watts.
some tips
You do not own the unit I assume so there are few things that you can do. However you are paying for the energy so spending a couple of dollars for some improvements can help.
There is a film you can buy from home depot that will seal the windows. It is applied like plastic wrap and then a hair dryer is used to seal it.
Caulk around window frames to seal the frame to the drywall.
Caulk any other areas that cold air can come in from
Check weather stripping around doors and repair or replace.
Set the thermostat on your fridge to a sensible setting cold enough to freeze and keep food cold but no more than that.
Cfl bulbs and turn lights off
set the thermostat for the heat at 68 use a blanket at your favorite spots
do not heat the house during times you are not there buy a programmable thermostat if needed
set water heater at 120.
Take shorter showers or take baths
I have a family of four and 1600 square foot four bedroom house I use 330 kwh. I also have a gas water and gas heat. and use about 20 therms for water and another 10- 14 when I heat the house.
I have a teenage daughter that takes very long showers
1 therm is equal to about 30 kwh my use of 20 therms for water is equal to about 600 kwh
heat would equal about 300 to 420 kwh
80 to 110 per month
gas is less costly per unit so the bill is still low
San Diego CA