: Probability question help me please

1. Sep 30, 2007

asraar

URGENT : Probability question help me please !!

For customers purchasing a full set of tries at a particular tries store, the events :
A = tries purchsed were made in United States
B = purchaser has tries balanced immediately
C = pruchas 1 er requests font-end alignment

along with A', B' and C'
Assume the following unconditional and conditional prpbabilities:
p(A)=0.75
p(B|A) 0.9
p(B|A')=0.8
p(C|AB)=0.8
P(C|AB')=0.6
P(C|A' B)=0.7
P(C| A '  B ' ) = 0.3

a ) constract a tree diagram consisting of first, second and third -generation branches and place an event label and apporiate probabilty next to each branch.

b) compute P ( A  B  C )

c ) compute P ( B  C )

d ) P (C)

e) compute P (A |B  C ).the probability of a purchasing of US. tries given that both balancing and an aligment were requested

Thank you

2. Sep 30, 2007

asraar

 >> is Intersection symbol

3. Oct 1, 2007

EnumaElish

Have you solved any of these? Or thought about? How far did you get?

4. Oct 1, 2007

ovoleg

We aren't here to solve problems flat out for you...People here want to help, not waste their and your time.

5. Oct 1, 2007

asraar

yes actually I tried to solve it..

but I did not know how to solve a , c and d

my solution for b ) is =

P (C / A intersiction B).P(A intersection B)
= P ( C/ A intersiction B ) . P (B / A ) . P (A)
= 0.8 * 0.9 * 0.75 = 0.54

and e )

= p (A intersection B intersection C ) / p ( B intersection C )
= 0.54 / 0.68
= 0.7941

6. Oct 1, 2007

asraar

Please I need the solution tonight coz I have Quiz in it tommorw morning

7. Oct 1, 2007

asraar

???????????????????????????????????????????????????????

8. Oct 1, 2007

HallsofIvy

Staff Emeritus
So what you are telling us is that you really don't want to learn anything, you just want to trick your teacher into thinking you know it?

Just out of curiosity, is it at all possible that by "tries" you mean "tires"?

Last edited: Oct 1, 2007
9. Oct 2, 2007

asraar

so you dunn wanna to help me ?

10. Oct 2, 2007

HallsofIvy

Staff Emeritus
People have been TRYING to help you! You show no sign of wanting to do YOUR part!