* Definition of "school": This could encompass primary, secondary, tertiary education, and various informal educational settings.
* Data collection challenges: Many African nations lack robust data collection systems for education.
* Variations between countries: Enrollment rates vary drastically from country to country based on factors like poverty, conflict, and government policies.
To get an estimate, you would need to consult reports from organizations like UNESCO (United Nations Educational, Scientific and Cultural Organization), UNICEF (United Nations Children's Fund), and World Bank, which periodically publish statistics on education in Africa. Even their figures represent estimates with varying degrees of accuracy.