Final answer:
The question seeks an estimate of 16 to 17-year-olds employed in summer 2012 in the U.S. but lacks sufficient data to calculate an accurate figure.
Step-by-step explanation:
The question asks for an estimate of the total number of individuals between 16 and 17 years old in the United States who had a summer job in 2012. While no specific percentage or data is provided regarding the employment of teenagers within this age group, the total population of those aged 14-17 in the same year is given as approximately 17 million. Without additional data, it's not possible to provide an accurate estimate for the number of employed 16 to 17-year-olds in that summer.