Posted by **Nahla** on Thursday, April 2, 2009 at 9:01pm.

Your Open QuestionShow me another »

If the ball is either blue or white, what is the probability that it was drawn from urn Y?

Assume that you randomly pick one of the urns: X, Y, or Z. You then randomly draw one ball out of the selected urn and note its color. The urns contain the following colored balls:

Urn X: 2 red, 1 white, and 2 blue.

Urn Y: 1 red, 2 white, and 3 blue.

Urn Z: 1 red, 2 white, and 1 blue.

If the ball is either blue or white, what is the probability that it was drawn from urn Y?

For this problem I did this and I can't figure out why it is wrong:

Pr(drawn from Y urn/is blue) + Pr(drawn from Y urn/ is

white)

(10/23)+(10/31)=540/713

## Answer This Question

## Related Questions

- Math (Probability) - An urn A contains 6 white balls and 7 black balls. And urn ...
- Math (Probability) - An urn A contains 6 white balls and 7 black balls. And urn ...
- statistics - An urn contains white and red balls. Four balls are randomly drawn ...
- statistics - An urn contains white and red balls. Four balls are randomly drawn ...
- finite - Urn A contains four white balls and five black balls. Urn B contains ...
- MATH - Urn A contains six white balls and three black balls. Urn B contains ...
- MATH - An urn contains 5 white and 6 black balls. Four balls are randomly drawn ...
- MATH(STATISTICS) - Urn A contains R red balls and W white balls, urn B contains ...
- mathematical statistic - Urn A contains six white balls and three black balls. ...
- statistic - An urn contains white and green balls. Four balls are randomly drawn...

More Related Questions