Problem

Refer to Exercise 4.29. Show that the posterior probability of default, given a fair ris...

Refer to Exercise 4.29. Show that the posterior probability of default, given a fair risk, equals the prior probability of default. Explain why this is a reasonable result.

REFERENCE:

Of a finance company’s loans, 1% are defaulted (not completely repaid). The company routinely runs credit checks on all loan applicants. It finds that 30% of defaulted loans went topoor risks, 40% to fair risks, and 30% to good risks. Of the non defaulted loans, 10% went to poor risks, 40% to fair risks, and 50% to good risks. Use Bayes’ Formula to calculate the probability that a poor-risk loan will be defaulted.

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