June 2024
Beginner to intermediate
352 pages
9h 29m
Korean
Content preview from 개발자를 위한 필수 수학
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69
2
장
확률
커피를 마실 확률이
0
.
425
%라는 의미입니다.
P
(커피
AND
암)
= P
(커피|암)×
P
(암)
= 0.85
×
0.005 = 0.00425
이 결합 확률은 다른 방향으로도 적용됩니다.
P
(암|커피)와
P
(커피)를 곱하면 커피를 마시는
사람이 암에 걸릴 확률을 구할 수 있습니다. 결과를 보면 알 수 있듯이 동일한 값을 얻습니다.
P
(암|커피)×
P
(커피)
= 0.0065
×
0.65 = 0.00425
조건부 확률이 없다면 다음처럼
P
(커피)와
P
(암)을 곱하는 것이 최선입니다.
P
(커피)×
P
(암)
= 0.65
×
0.005 = 0.00325
만약 사건
B
가 사건
A
에 영향을 미치지 않는다면 조건부 확률
P
(
A
|
B
)는 무엇을 의미할까요?
이는
P
(
A
|
B
)
=
P
(
A
)이며 사건
B
가 발생해도 사건
A
의 발생 가능성에 아무런 차이가 없다는
의미입니다. 따라서 두 사건이 종속적인지 여부에 관계없이 결합 확률 공식을 다음과 같이 바
꿀 수 있습니다.
3
P
(
A AND B
)
= P
(
A | B
)×
P
(
B
)
마지막으로 합 확률과 조건부 확률에 대해 이야기하겠습니다. 사건
A
또는
B
가 발생할 확률을
계산하고 싶지만,
A
가
B
의 확률에 영향을 미칠 수 있는 경우 덧셈 법칙을 다음과 같이 수정합
니다.
P
(
A OR B
)
= P
(
A
)+
P
(
B
)-
P
(
A
|
B
)×
P
(
B
)
이는 상호 배타적인 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.