Averaging Temp Sensors?

I have 5 temp and humidity sensors scattered throughout the house. Smartthings home screen is able to average them coming up with a whole house temp. How can I get something like this to display on sharptools?? Is it even possible?

You could use an expression within a rule to create an average of the temperatures and write that to a SharpTools Variable for display on your dashboard.

I’m guessing I’d have to make variables for each temp sensor ie if BedroomSensor Updates the. #sensor1 updates, then a master one for all with the expression?