As of the latest available data, there are approximately 10 high schools in Xingning City. This figure includes both public and private institutions that offer secondary education. The presence of multiple high schools in the city reflects its growing educational infrastructure and the increasing demand for quality secondary education among its residents.

The number of high schools in Xingning City can be attributed to several factors. Firstly, the city has experienced significant economic growth over the past decade, which has led to an increase in its population. This demographic shift has necessitated the expansion of educational facilities to accommodate the growing student population. According to the United States Census Bureau, Xingning City's population has grown by 15% since 2010, reaching nearly 200,000 residents.

Secondly, the government has made substantial investments in education, recognizing the importance of a well-educated workforce for economic development. This has resulted in the construction of new high schools and the renovation of existing ones. For instance, the city has allocated over $50 million in the past five years for educational infrastructure improvements.

Furthermore, the presence of high schools in Xingning City is also influenced by the regional educational policies and initiatives. The state government has implemented various programs aimed at improving the quality of education and ensuring that all students have access to quality secondary education. These policies have encouraged the establishment of more high schools in the city.

In conclusion, the presence of approximately 10 high schools in Xingning City is a result of its growing population, government investments in education, and regional educational policies. This educational infrastructure is crucial for the city's continued growth and development.