Final answer:
The percentage of North American adolescents completing high school is likely very high, with developed countries having an enrollment rate of about 91% in 2005. Recent U.S. data suggests strong graduation rates with the majority of graduates pursuing college education.
Step-by-step explanation:
The percentage of North American adolescents completing high school has risen over the years. In developed countries, as reported in the United Nations Development Program, high school enrollment was about 91% in 2005. Considering the relevance of education in contemporary society and the emphasis on high school as a basic educational requirement, it is reasonable to suggest that the percentage of adolescents completing high school in North America is very high.
In the context of the United States, specific to recent data, the percentage could be inferred from the information that two-thirds of high school graduates are enrolled in college soon after completing high school, as stated by the Bureau of Labor Statistics and the National Center for Education Statistics (NCES). This indicates a strong graduation rate that could be correlated with the high level of enrollments. Providing a precise percentage would require current statistics which are not included in the provided information.