However, I feel a need to correct you on Leif Ericsson:According to the saga of the Greenlanders he was preceded by Bjarni Herjólfsson, zie https://en.wikipedia.org/wiki/Bjarni_Herj%C3%B3lfsson
Leif Ecrison, Imhotep, Hammurarbi, and Grace Kelly were the more obvious ones that I should have got.
Though may I suggest to accept the spelling "Friedrich" for Frederick (considering it was his actual name).
Just looked it up, Van Diemen was Tasman's sponsor. I think that makes it even more frustrating.
Should have gotten Ericson and Byron. Knew the Crazy Horse one too but the name didn't reach the surface of my mind - I could only think of Sitting Bull.
It appears that 10 is the average score so I guess the introductory sentence is correct.
This is hard!
Honestly, being active on this site immediately puts you far above the curve at your age.
Also managed to not even notice two of the questions.