Passage Summary: Because only a small slice of all service workers end up on big corporate boards, the author concludes that service workers don't have enough representation in those boardrooms.

Conclusion: People from service professions are underrepresented on the boards of the largest North American corporations.

Reasoning: Only a tiny percentage of people who work in service professions hold seats on the boards of the 600 largest corporations.

Analysis: The author is tripping over a common statistical hurdle: confusing the percentage of a group with the percentage of a destination. Just because a small percentage of all service workers are on boards doesn't mean they are underrepresented relative to their total numbers in the workforce. If service workers make up a tiny fraction of the population but hold a larger fraction of board seats, they would actually be overrepresented. Look for an answer that points out the author's failure to compare the number of service workers on boards to the total number of service workers available or the total number of board seats.