Final answer:
The exact percentage of students ages 6-21 with higher incidence disabilities of all students with disabilities is not provided, but it is a significant proportion based on broader statistics indicating that around 26% of the U.S. population has some form of disability.
Step-by-step explanation:
The question seeks to determine the percentage of students ages 6-21 with higher incidence disabilities within the larger population of all students with disabilities. According to the National Center for Education Statistics (NCES), students with disabilities have seen improving graduation rates from high school, reflecting enhanced educational programs. However, a significant percentage of students still face challenges, especially in lower-income areas and states with smaller education budgets. Additionally, disparities in identification and support continue to affect outcomes for students with disabilities.
While specific percentages for the subgroup of students with higher incidence disabilities are not provided directly, broader statistics reveal that approximately 26% of people in the U.S. have a disability, with considerable variation based on factors such as race, ethnicity, and geography. It is also noted that 96% of people with chronic conditions do not have a visibly evident condition.
Therefore, without the exact data, it is not possible to give a precise answer to the question of what percentage of students ages 6-21 have a higher incidence disabilities of than all students with disabilities. Yet the statistics suggest it is an essential and non-negligible proportion.