It is certainly reflective of the ratio I experienced between 1963 and 1971. I did not have a male teacher until Grade 5 then again in Grade 8 middle school. I saw no problem with it as a child and see no problem with it from the perspective of adult hindsight.

The ratio of importance to me is supportive teachers who foster a learning environment versus negative teachers cranking the sausage machine. Personally, I found the male female ratio from this perspective to be balanced across, great, average, lousy (as I encountered more male teachers in high school).