Answer:
The correct revision of the given fragment is:
"A high level of math skills is important for some careers, for example, careers in engineering, computer science, or architecture."
explanation:
This revision improves the sentence by adding clarity and correctly introducing the examples of careers that require math skills. The phrase "for example" helps to indicate that the list of careers following it is not exhaustive but rather provides a few examples. Additionally, the use of commas separates the introductory phrase "for example" from the list of careers, making the sentence grammatically correct.
Therefore, the revised sentence is: "A high level of math skills is important for some careers, for example, careers in engineering, computer science, or architecture."