Question

In: Statistics and Probability

An automobile insurance company divides customers into three categories, good risks, medium risks, and poor risks....

An automobile insurance company divides customers into three categories, good risks, medium risks, and poor risks. Assume that 74% of the customers are good risks, 20% are medium risks, and 6% are poor risks. Assume that during the course of a year, a good risk customer has probability 0.005 of filing an accident claim, a medium risk customer has probability 0.01, and a poor risk customer has probability 0.025. A customer is chosen at random.

What is the probability that the customer is a good risk and has filed a claim? Round the answer to four decimal places.

What is the probability that the customer has filed a claim? Round the answer to four decimal places.

Given that the customer has filed a claim, what is the probability that the customer is a good risk?

Solutions

Expert Solution

Given

P(Good risk) = 74%

= 0.74

P(Medium risk) = 20%

= 0.20

P(Poor risk) = 6%

= 0.06

P(Claim/Good risk) = 0.005

P(Claim/Medium risk) = 0.01

P(Claim/Poor risk) = 0.025

G : Good risk

C : Claim

i)

P( good risk and has filed a claim) = P(GC)

= P(G) * P(C/G)

= 0.74 * 0.005

= 0.0037

  

Therefore, The probability that the customer is a good risk and has filed a claim is 0.0037.

ii)

P( customer filed a claim) = P(C)

   = P(GC) + P(MC) + P(PC) .....(1)

Where

P(GC) = P(G) * P(C/G)

= 0.74 * 0.005

=0.0037

P(MC) = P(M) * P(C/M)

= 0.20 * 0.01

= 0.002

P(PC) = P(P) * P(C/P)      

= 0.06 * 0.025

= 0.0015

From (1)

P(C) = P(GC) + P(MC) + P(PC)

= 0.0037 + 0.002 + 0.0015

= 0.0072

Therefore, the probability that the customer has filed a claim =0.0072

iii)

= 0.5139

Therefore,

given that the customer has filed a claim, the probability that the customer is a good risk = 0.5139


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