Probability

mssmith88

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Jun 16, 2010
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A bank finds that the relationship between mortgage defaults and the size of the down payment is given by the table.

Down Payment (%) 5% 10% 20% 25%
# of mortgages w/ this down payment 1260 700 560 280
Probability of Default .05 .03 .02 .01

If a default occurs, what is the probability that it is on a mortgage with a 5% down payment? Use Bayes' Formula to solve this problem.

The work that I have done so far:

I created a tree diagram; the left part of the diagram has four branches (one for each of the four levels of down-payment). Then I split each of the four branches into two branches one for default and the other for no default.
 
That's fine. Did you put in the numbers at each fork and at the end of the branches?

That's not fine. Did you use Bayes formula?
 
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