Final answer:
The percentage of job openings that are published varies by industry, with many positions not publicly advertised and instead filled through networking or internal referrals.
Step-by-step explanation:
The question pertains to the distribution of job openings and their visibility, specifically what percentage of them are published. Based on the information provided and the context of job markets, it can be inferred that not all job openings are publicly advertised or published. Job listings and opportunities can vary drastically by industry, with some having a higher visibility of openings online and others relying on networking and internal channels. The percentage of 'hidden' jobs, those not publicly advertised, can be substantial. Keep in mind that these figures may fluctuate over time and by region or industry.