Do you believe these numbers? Is there a cite somewhere in the literature for valid, proctored IQ tests being given to representative samples of different professions for these kinds of comparisons? The link you've provided is to a company selling online IQ tests.
Is the argument that electrical and mechanical engineers are not smarter than the average person? How about figure 8 (PDF page 86) of:
https://web.archive.org/web/20120905095856/http://www.ssc.wi...