# Probabilities

• December 14th 2009, 11:14 AM
SirOJ
Probabilities
Sets are beginning to do my head in. A little help please...

For two events
J and K, if P(J) = 0.1 and P(K) = 0.4 and
P(J intersection K) = 0.05, what is

P
(J' intersectionK)? where J' = not in J

Drawing a venn diagram, and fillinf in figures I got answer = 0.35

Is this correct?
• December 14th 2009, 11:20 AM
Plato
Quote:

Originally Posted by SirOJ
Sets are beginning to do my head in. A little help please...

For two events
J and K, if P(J) = 0.1 and P(K) = 0.4 and
P(J intersection K) = 0.05, what is

P
(J' intersectionK)? where J' = not in J

Drawing a venn diagram, and fillinf in figures I got answer = 0.35

Is this correct?

$P(K)=P(K\cap J)+P(K\cap J')$