Final answer:
The given information does not provide average salaries for each job category, so it is not possible to determine which job categories have average salaries higher than $1200.
Step-by-step explanation:
To find the job categories whose average salary is more than $1200, we need to refer to the given information. Unfortunately, the information provided does not mention the average salaries for each job category.
Without this information, we cannot determine which job categories have average salaries higher than $1200.