To determine how many months Sinclair read 4 or more books, follow these steps:
1. List the number of books read each month:
- Months: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
- Books: 2, 3, 5, 6, 4, 5, 5, 2, 2, 5
2. Identify the months where Sinclair read 4 or more books:
- Month 3: 5 books
- Month 4: 6 books
- Month 5: 4 books
- Month 6: 5 books
- Month 7: 5 books
- Month 10: 5 books
3. Count the number of months with 4 or more books:
- Count the months: Month 3, Month 4, Month 5, Month 6, Month 7, Month 10
4. Total number of such months:
- There are 6 months where Sinclair read 4 or more books.
Therefore, Sinclair read 4 or more books in [tex]\(\boxed{6}\)[/tex] months.