Garrison Keillor's statistically... - Tradução em português

alguém pode me ajudar com a tradução desse parágrafo?

Garrison Keillor's statistically impossible Lake Wobegon exists across America today – every child is above average (at least in their parents' eyes). Grade inflation has kept pace with ego inflation: the average high school graduate today has a grade point average of nearly 3.0, and many high schools have twenty-five to forty valedictorians a year.

Thanks in advance...