Help with probability

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RAVENSFOOTBALL56

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Dec 5, 2009
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Down payment 5% 10% 20% 25%

1260 700 560 280 # of mortgages with ths down payment

.05 .03 .02 .01 probability of default
when posted the chart is not completely lined up*******

The question from the table is....if default occurs, what is the probability that it is on a mortgage with a 5% down payment....They want me to use bayes' formula and construct a probability tree and im lost! Please help.



question 2

The table shows the percent of U.S. Homes in each region and the percent per region using air conditioner

Northeast Midwest South West
Region 19.4 23.7 35.2 21.5

Uses A/C 22.1 51.3 69.4 26.9

I need to figure out the probability that a household in the midwest is using air conditioning.

Also need a probability tree.


Question 3


Age proportion in population age 20 or higher proportion living alone

20-34 .293 .088

35-54 .412 .107

55-74 .212 .191

75-older .083 .393

I need to find the probability that a randomly selected person age 20 or older lives alone is age 75 or older, and a probability tree
 
RAVENSFOOTBALL56 said:
Code: 
Down payment            5%          10%                20%                 25%

                        1260        700                 560                 280     # of mortgages with ths down payment

                         .05          .03                .02                 .01    probability of default
when posted the chart is not completely lined up*******

The question from the table is....if default occurs, what is the probability that it is on a mortgage with a 5% down payment....They want me to use bayes' formula and construct a probability tree and im lost! Please help.



question 2

The table shows the percent of U.S. Homes in each region and the percent per region using air conditioner
Code: 
                                    Northeast              Midwest              South                 West
Region                           19.4                       23.7                   35.2                   21.5

Uses A/C                       22.1                        51.3                   69.4                   26.9

I need to figure out the probability that a household in the midwest is using air conditioning.

Also need a probability tree.


Question 3

Code: 
Age                   proportion in population age 20 or higher               proportion living alone

20-34                                .293                                                            .088

35-54                                .412                                                             .107

55-74                                .212                                                             .191

75-older                            .083                                                             .393

I need to find the probability that a randomly selected person age 20 or older lives alone is age 75 or older, and a probability tree
Click to expand...

Please state Bayes' Theorem

Please show us your work, indicating exactly where you are stuck - so that we know where to begin to help you.
 
bayes formula

P(fi/E)= P(fi) * P(e/fi)
OVER
P(f1) * P(E/F1) +....+P(Fn) * P(E/Fn)

all the i's after the F's are down below the f's a bit and all the / lines are intented to be straight lines...

I dont even know where to begin with any of these
 
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