/sci/ - Science & Math » Thread #11464177

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Anonymous Thu 12 Mar 22:21:41 2020 No.11464177 View Reply Original Report

Quoted By: >>11464190 >>11464192 >>11464211 >>11464312

Guys I'm frustrated and confused. In the monty hall problem, if the host doesn't open any door after I pick one, will the probably of winning still be 2/3 if I switch? or it's 1/3? it's 1/3 right?

Anonymous

Anonymous Thu 12 Mar 2020 22:25:34 No.11464190 Report

Quoted By: >>11464205 >>11464249

>>11464177
It's 1/2 if you switch, 1/3 if you stay

Anonymous

Anonymous Thu 12 Mar 2020 22:26:09 No.11464192 Report

Quoted By:

>>11464177
Imagine being the retard who posts this shit every week.

Anonymous

Anonymous Thu 12 Mar 2020 22:37:06 No.11464205 Report

Quoted By:

>>11464190
but only after host reveals one empty slot. Before that it stays 1/3.

Anonymous

Anonymous Thu 12 Mar 2020 22:40:16 No.11464211 Report

Quoted By:

>>11464177
> if the host doesn't open any door after I pick one, will the probably of winning still be 2/3 if I switch?
If you switch again before revealing the contents of any of the doors, would your chance of winning be 3/3?

Anonymous

Anonymous Thu 12 Mar 2020 22:55:30 No.11464249 Report

Quoted By:

>>11464190
I pick 1 out the 3 doors, I have 1/3 chance of winning car and 2/3 chance of winning goat. So it's very likely that I chose the goat then the host let me decide if I would like to switch to one of the 2 doors, since there are only 2 options I have a 1/2 chance of winning goat or car. did I explain this right?

Anonymous

Anonymous Thu 12 Mar 2020 23:25:13 No.11464312 Report

Quoted By:

>>11464177
In these types of problems, manipulate the conditions to understand them. 1,000 doors, 999 goats, and 1 car...The choice is obvious

Anonymous

Anonymous Fri 13 Mar 2020 01:23:03 No.11464673 Report

Quoted By: >>11464717 >>11464831

before monty reveals goat:
group A 1/3
-door1 1/3
group B: 2/3
-door2 1/3
-door3 1/3

after monty reveals goat:
group A 1/3
-door1 1/3
group B: 2/3
-door2 0 (goat)
-door3 2/3

Anonymous

Anonymous Fri 13 Mar 2020 01:35:55 No.11464717 Report

Quoted By: >>11465275

>>11464673
Why would it ever be 2/3?

Anonymous

Anonymous Fri 13 Mar 2020 02:11:38 No.11464831 Report

Quoted By:

>>11464673
nice

Anonymous

Anonymous Fri 13 Mar 2020 05:49:27 No.11465275 Report

Quoted By:

>>11464717
the total probability across all doors of finding the prize is 1 (meaning the prize exists behind one of the doors).
after revealing the goat we have:
1 = 1/3 + 0 + X.
1/3 is for the first door.
0 is for the door monty opened (goat).
X is the remaining door.
X = 2/3

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