This experiment demonstrates the futility of job hunting cold-calling style. In my experience the best way to get noticed is through networking, especially through friends in the field. If I were hiring, I would give more consideration for someone who was recommended even by a friend of a friend. Our job hunting time is much better spent networking than spanning every craigslist job posting with our resumes. I wish someone does a counter experiment with networking vs craigslist spamming.
I am an electrical engineer by schooling, but now work as a software engineer. I have done quite a bit of higher math in school, but in my career, I find that basic math is more useful. Interestingly, although I know some higher math, software engineering requires intuitive understanding of basic math, which some of us skimmed over while cramming for calculus exams.