Stats question

[dandymandy10]

can someone please help me with these....

Pr(A)=0.62 ; Pr(B | A)=0.27 ; Pr(B&A) = ?

Pr(B) = 0.47 ; Pr(B&A) = 0.36 ; Pr(A | B)= ?

Thank u!

 

[stapel]

What formulas have you been given, which relate P(A), P(B), P(A | B), and P(A & B)?

Thank you.

Eliz.

 

[dandymandy10]

In the book there's an example that shows...

P(A or B) = P(A) + P(B) - P(A & B)

 

[pka]

Here is what you need.
\(\displaystyle \L
P(A|B) = \frac{{P(A\& B)}}{{P(B)}}\)

 

[dandymandy10]

so for the second one, it'd be 0.36/0.47 = 0.76?

or am i missing something?