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If the entire population of the world was dumped into the middle of the ocean, would it cause enough water displacement to notice it on the shorline?

Estimate 70 kg per person (a little more than 150 lbs). If people are close enough to neutrally boyant in water to assume that they have the same density as water (1 kg/liter) and you have 6.5 billion people then the total volume will be 455 million cubic meters. Spread that evenly over 335,258,000 square kilometers of ocean surface and you get 0.0014 mm displacement. Nope, not enough to notice.

Estimate 70 kg per person (a little more than 150 lbs). If people are close enough to neutrally boyant in water to assume that they have the same density as water

Actually buoyancy has nothing to do with it. You could take a cubic foot of rock and a same cube of wood and forcing the wood under water they would both take up the same amount of water.

So to get your answer, you would have total up the mass of all people, then........

Aw nevermind, I'll let you win this one.......I'm not about to get in any pond or lake or ocean thats filled up with people. I'll stand on the shore and watch