One of two urns is chosen at random with one as likely to be chosen as other. Then a ball is drawn from the ch?
one of two urns is chosen at random with one as likely to be chosen as other. Then a ball is drawn from the chosen urn. Urn 1 contains 1 white and 4 red balls. and urn 2 has 4 white and 1 red ball. If a white ball is drawn, what is the probability it came from urn 2?

Question

One of two urns is chosen at random with one as likely to be chosen as other. Then a ball is drawn from the ch?
one of two urns is chosen at random with one as likely to be chosen as other. Then a ball is drawn from the chosen urn. Urn 1 contains 1 white and 4 red balls. and urn 2 has 4 white and 1 red ball. If a white ball is drawn, what is the probability it came from urn 2?

anonymous · Answer

I might be a bit rusty, but I believe the answer is 4/10

anonymous · Answer

you are given that a while ball is drawn, no probability is to be calculated here.
there are 5 white balls, 4 of which are in urn 2.

the probability is 4/5, not 4/10.  typo on my part

anonymous · Answer

1/2 * 4/5= 4/10 =0.4
It is the probability of choosing urn 2 multiply the probability of getting a white ball.

swissgirl · Answer

Do you follow what ghost answered?