It's called the Secretary Problem

Blame Quintushalls for this.

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shanen
Posts: 11
Joined: Fri Jul 05, 2019 7:21 am

It's called the Secretary Problem

Post by shanen »

The comic is https://www.smbc-comics.com/comic/percent

The mathematics is called the Secretary Problem. https://en.wikipedia.org/wiki/Secretary_problem for reference. I was just looking at it because I wanted to figure out the probability that you wind up with #2 or #3 or some other lower ranked choice. Obviously #2 is much less than 37%, but how much less?

There are two solution approaches. I can't remember the direct analytic solution, but the other approach is based on permutations. For example, it is (if I remember correctly) also true that the #1 choice is within the first n/e choices 1/e percent of the time (again about 37%), in which case you are screwed and cannot get #1 since you discarded those candidates. that leaves 63% to be tested, but you subtract the 37% for success at #1, which leaves about 26%. The cases in that 26% where you are going to get the #2 option are the permutations where #2 was not in the first n/e but appears before #1 in the remainder. Basically the same for #3 and down.

So does anyone know the solution?

tao

Re: It's called the Secretary Problem

Post by tao »

Off-topic to what you wrote, but related to this comic:
Tim Minchin's song "If I didn't have you"
https://www.youtube.com/watch?v=Zn6gV2sdl38

cellocgw
Posts: 25
Joined: Thu Nov 07, 2013 3:19 pm

Re: It's called the Secretary Problem

Post by cellocgw »

The way I was told it, the solution to the Secretary Problem is always:

Hire the one with the biggest boobs.

Boy were workplaces toxically sexist back then. Yes, worse than today.

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