How high can the average 12 year old jump from a 2 foot start?

I posted some sheets of paper going up to about 9 feet on my wall and have been practicing jumping straight up and seeing how high I can reach. What would you estimate is the average jump height?

Answers:

Why cant i ever make a volleyball team??

i would say about taller then 6 feet i am 5'3 and i can tough the Celling of my house. lol

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Why are Cuba,Russia,Brazil, and Japan the most dominant volleyball nations these days?

umm... well when i was 12 i had maybe only a 15in vertical which was still kinda high on my team

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