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Probability Tool

Interactive tree & contingency table solver

Enter fraction(s) (e.g. 9/20 or 1/3, 1/3, 1/3) or counts (e.g. 3, 4, 5):

Draws (Levels):

Tap fractions on the tree...

🔢 Display Unit

Decimals (0.45)

Percentages (45%)

Counts (N)

🏷️ Event Names

Event A Name:

Event B Name:

2x2 Contingency Matrix (Type in any cell)

	B	B̄ (Not B)	Total
A
Ā (Not A)
Total