this post was submitted on 21 Jan 2024
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Uhhhh..... no? The immortal guy would be the outlier, and even then only if they've been around for a long time already. They could be in their 30's, in which case they won't become an outlier for like 80-90+ more years.
In an intuitive sense, yes, absolutely.
But in a mathematical or statistical sense, no. Remember, adding or subtracting any number to/from infinity yields infinity again (also true for other operations). In turn, the mean of any set of numbers that contains infinity is also infinity.
An outlier, however, is defined as a large deviation from the mean. Therefore, everyone with a normal lifespan would be considered a statistical outlier. It's kind of a mathematical pun.
That is NOT the definition of an outlier. There IS no set mathematical definition of an outlier, in fact. What is considered an outlier is greatly determined by what the dataset actually is. Please do more research on what an outlier actually is, even the wikipedia page on outliers is surprisingly high quality(aka has good sources, read those), so it's not hard.
That all being said, let's use your rigid definition. There have been approximately 100 billion humans to have ever lived, from now until all the way back 200,000-300,000 years ago when homo sapiens first emerged. The absolute oldest humans to ever live(ignoring Mr.Immortal) made it to about 120. Mr.Immortal has to be human to be factored into the calculations of human lifespan, so they are at the absolute MOST 300,000 years old.
Now, let's go ahead and say that all 100 billion humans lived to that maximum age of 120. Obviously not even remotely the case, but this is best case scenario here. The mean of a dataset is found by adding all of the numbers in the dataset together and then dividing by the number of data points within the set. So in this case it would be "(120(100,000,000,000) + 300,000) ÷ 100,000,000,001)"
Now if you do the math on that, you find that even with Mr.Immortal included and every human living the absolute longest life possible, the mean is... 120.0000029988.
Now tell me, what is closer to that number, 300,000 or the actual average lifespan of humans(70 something)? It's not even close, and since the rate of population expansion keeps increasing, Mr.Immortal would have to wait for humanity to die out before the mean could ever increase enough to make US the outliers.