PLS chart, page-17136

And here is a quote from the site Al recommends :-

"So what are Bollinger Bands? They are curves drawn in and around the price structure usually consisting of a moving average (the middle band), an upper band, and a lower band that answer the question as to whether prices are high or low on a relative basis. Bollinger Bands work best when the middle band is chosen to reflect the intermediate-term trend, so that trend information is combined with relative price level data."

As Al might explain, if asked, there is a significant difference between the terms "average" and "median"

Note the initials Al as in Al Capone should not be confused with AI as in Artificial Intelligence

Al Capone (the distinguished member of this site) is certainly not artificial, and gives
every indication of being highly intelligent.

So having sorted that there is a need to study different meanings for "average" and "median"
let's not be mean when discussing these terms, as well as their companion statistical term "mean".

I hope this link will make the last point about "means" clear :-

https://www.cuemath.com/data/difference-between-average-and-mean/

Best of Luck to All, Recherche