Averages are for Belmont Perth Airport, which is 7 miles from Perth.
Process engineering is related to all chemical, biological, mechanical and manufacturing processes. Process engineers use computer software to design and monitor the processes used across these engineering industries.
Computer engineering is engineering of software and hardware at the level of computer (computation). that's how I look at computer science. By the way, you can be a pure computer scientist, and just do research, and decide to isolate yourself from the engineers.