“Comedian” has nothing to do with a “median,” but there are “co-median” jokes.
 
“Statistical inference joke - why are two medians in a single data set funny? Because it’s a co-median” was posted on Reddit—Jokes on February 3, 2016.
 
“A co-median is just an average jokester” was posted on Twitter by iPrash on August 3, 2010.  “What is an average humourist? A Co-median” was posted on “What do you call an average comic? A co-median” was posted on Twitter by Michael Barrowman on August 8, 2019. Reddit—Dadjokes on October 9, 2020.
   
     
Wikipedia: Median
In statistics and probability theory, a median is a value separating the higher half from the lower half of a data sample, a population or a probability distribution. For a data set, it may be thought of as “the middle” value.
                 
Twitter
iPrash
@iPrash
A co-median is just an average jokester.
7:42 AM · Aug 3, 2010·Twitter for iPhone
   
Twitter
Car-nka-tar
@AdvocyT
I remember drawing a triangle with a double line as a median in my geometry exam, and I named it a “co-median”.
6:57 AM · Apr 16, 2013·UberSocial for BlackBerry
 
Twitter
Dubious fellow
@dubikan
A statistician stand-up: a co-median
8:39 PM · Sep 23, 2014·Twitter for Android
 
Twitter
Ralfs Alsiņš
@Pokaniac
In today’s Statistics for Social Sciences:
Hey, kids, what do you call a funny median?
A co-median.
8:56 AM · Mar 3, 2015·Twitter for Android
 
Reddit—Jokes
Posted by u/vladcreations February 3, 2016
Statistical inference joke - why are two medians in a single data set funny?
Because it’s a co-median _^
 
Twitter
Dirk Dresden
@DirkDresden
Statistical inference joke - why are two medians in a single data set funny?: Because it’s a co-median _^  s… http://bit.ly/1VLn2ph
7:59 AM · Feb 3, 2016·twitterfeed
 
Twitter
Akash
@vaderakash
Me: Why is the second median of a triangle funny?
She: I dont care
M: Bcos it’s a co-median
S: This is such an average joke
M: Wow, u r mean
7:08 AM · May 20, 2016·Twitter for Android
 
Twitter     
..
@DarsanParmar32
my math teach called me average.
How mean !
haha, what a co-median
Enough laugh mode.
2:02 AM · Feb 8, 2017·Twitter for Windows Phone
 
Twitter
Andrew ‘Hold your MP to Account’ Tate.
@Spudfish83
What do you call an average stand-up who’s carrying a canister of carbon monoxide?
A CO-median.
#edfringe #edfringe2019
3:09 AM · Jul 30, 2019 from Skelton, England·Twitter for Android
 
Twitter
Michael Barrowman
@MyKo101AB
Replying to @kareem_carr
What is an average humourist?
A Co-median
8:34 AM · Aug 8, 2019·Twitter for Android
     
Twitter
Andrewbraic
@chainedreality
If I make mostly math jokes does that make me a co-median?
12:05 PM · Dec 9, 2019·Twitter for Android
   
Twitter
Laurie Dulany
@LaurieDulanyS
Replying to @stu_rush
Stop being a co-median. I’m not in the right mode for this.
10:44 PM · Jul 25, 2020·Twitter for Android
 
Twitter
Colin McGuire
@realColinMac
Why are two medians in a single #Data set funny? Because it’s a co-median
#DataScience #programming #100DaysOfCode #Python #PyTorch #HTML #Coding #girlswhocode #CodeNewbie #BigData #javascript #Linux #RT
12:17 AM · Sep 25, 2020·Twitter for Android
 
Reddit—Dadjokes
Posted by u/theearlofcrankcase October 9, 2020
What do you call an average comic?
A co-median