Conditional probability. Independence of events
Conditional probability. Independent and dependent events.
The probability of occurrence of an event A at the condition, that an event B takes place, is called the conditional probability and calculated by the formula:
where
À
,
Â
Å
,
Ð
(
Â
)
0.
The events
À
,
Â
Å
are
independent
events
, if
Ð
(
À
Â
) =
Ð
(
À
)
·
Ð
(
Â
).
Otherwise, the events À and  are called dependent events .