× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
f
3
b
2
e
2
b
2
j
2
E
2
o
2
L
2
m
2
R
2
C
2
b
2
New Topic  
mathinator mathinator
wrote...
Posts: 60
Rep: 2 0
7 years ago
Urn A contains 6 white marbles and 4 red marbles. Urn B contains 3 red marble sand two white marbles. A marble is selected at random from urn A, and then placed in urn B. Finally, a table is selected at random from urn B. What is the probability that the marbles selected from urn A was red, given that the marble selected from urn B is red?
Read 137 times
1 Reply

Related Topics

Replies
wrote...
Staff Member
7 years ago
Urn A                                      .                                  Urn B
                                                .
6/10    ------------------------>     W   --------------------------- 3/6 ------------------>w
                                                     --------------------------- 3/6 ------------------>R
                                               .
                                               .
4/10    ------------------------>     R  --------------------------- 2/6 ------------------>w
                                                    --------------------------- 4/6 ------------------>R

A } 6w, 4r
B } 2w, 3r

P (red from A/red from B)= P(red B/red A) P(red A)/ P(red B)
                                              = [(4/6) x (4/10)] / [(3/6) x (6/10) x (4/6) x (4/10)]
                                              = (4/15) / [(3/10) x (4/15)] = 0.4706
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  590 People Browsing
Related Images
  
 816
  
 633
  
 605
Your Opinion
Do you believe in global warming?
Votes: 488