確率計算機

私たちの無料確率計算器は、迅速で正確かつ無制限の計算に最適なオンライン数学ツールです。ログイン不要で、単純な事象から条件付きシナリオまでの複雑な確率問題を解決できます。この基本的な数学計算器は、時間を節約し、学習を向上させ、学生、専門家、趣味愛好家を問わずデータ駆動型の意思決定をサポートします。

単一イベント確率計算機

結果
単一イベント確率	値（小数）	値（パーセント）
P(E)	-	-
P(E')	-	-

確率の公式

The Single Event Probability Calculator uses the following formulas:

P(E) = n(E) / n(T) = (number of outcomes in the event) / (total number of possible outcomes)

P(E') = P(not E) = 1 - P(E)

Where:

P(E) is the probability that the event will occur,

P(E') is the probability that the event will not occur,

n(E) is the number of outcomes in the event E,

n(T) is the total number of possible outcomes.

複数イベント確率計算機（A＆Bは独立したイベント）

結果
複数イベント確率	値（小数）	値（パーセント）
P(A)	-	-
P(A')	-	-
P(B)	-	-
P(B')	-	-
P(A ∩ B)	-	-
P(A ∪ B)	-	-
P(A \| B)	-	-
P(B \| A)	-	-

確率の公式

The Multiple Event Probability Calculator uses the following formulas:

P(A) = n(A) / n(T)

P(A') = P(not A) = 1 - P(A)

P(B) = n(B) / n(T)

P(B') = P(not B) = 1 - P(B)

P(A ∩ B) = P(A) × P(B)

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

P(A | B) = P(A ∩ B) / P(B)

P(B | A) = P(A ∩ B) / P(A)

Where:

P(A) is the probability that event A occurs,

P(A') is the probability that event A does not occur,

P(B) is the probability that event B occurs,

P(B') is the probability that event B does not occur,

P(A ∩ B) is the probability that events A and B both occur,

P(A ∪ B) is the probability that events A or B occur,

P(A | B) is the probability that event A occurs, given that event B has occurred,

n(A) is the number of outcomes in the event A,

n(B) is the number of outcomes in the event B,

n(T) is the total number of possible outcomes.