I'm going with 6 or more for the first question but would love for you all to tell me who you think says the title?
Of the Survivor who compete in the immunity challenge, How many will never successfully hit a single target in the immunity challenege.
did some homework
IMMUNITY CHALLENGE: CHOOSE YOUR WEAPON
When the tribes reconvened for an Immunity Challenge, Jeff Probst explained that this would be a target Challenge involving numerous weapons. The first would be a blowgun, followed by a spear, and finally, one member from each tribe would match up against each other with a bow an arrow for Immunity. The amount of arrows each tribe member would be allotted would be determined by the blowgun and spear rounds. When all the arrows are gone, the player to hit closest to center wins immunity for the tribe.
The blow guns didn't hit much as Mogo Mogo's Jerri Manthey, the 33-year-old tribe member of SURVIVOR: THE AUSTRALIAN OUTBACK from Stuttgart, Germany, was the only castaway to even hit the target. The All-Stars didn't do much better with the spears, as Lex had a chance to give his tribe a huge advantage by landing his spear closer to the target than Rupert's, but he couldn't do it.
In the final, decisive round, Chapera chose Boston Rob to be their marksman while Jerry volunteered for Mogo Mogo. Each was given three arrows, and the arrow that hit closest to the center of the target would win. But it only took one: Boston Rob hit the target once, while Jerry couldn't hit it at all. Once again, Mogo Mogo had lost Immunity.
http://www.cbs.com/primetime/survivor8/show/episode08/s8story4.shtml