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Vinton Auto Insurance Assignment

Vinton Auto Insurance is deciding how much money to keep in its checking accounts to cover
insurance claims. In the past, the company held some of the premiums it received in interest-bearing
checking accounts and put the rest into investments that are not quite as liquid but tend to generate a
higher investment return. The company wants to study cash flows to determine how much money it
should keep in its checking accounts to pay claims. There are two types of claims: “repair” claims, and
“totaled” claims. After reviewing historical data, the company has determined that the number of
repair claims filed each week is a random variable that follows the probability distribution shown in
the following table:

Repair Claims 0 1 2 3 4 5 6 7 8 9 10

Probability 0.030 0.106 0.185 0.216 0.189 0.132 0.077 0.039 0.017 0.007 0.002
The company has also determined that the average cost per repair claim is normally distributed with
a mean of $1,200 and standard deviation of $300 (with no negative values). To be clear, the costs of
covering of each individual repair claim are not normally distributed; rather, the average cost per
repair claim for a given week is normally distributed with a mean of $1,200 and a standard deviation
of $300. In addition to repair claims, the company also receives claims for cars that have been “totaled”
and cannot be repaired. There is a 15% chance of receiving one claim of this type in any week, and
there is no chance of receiving more than one in any week. The cost for “totaled” cars is given by the
following: $7500 * X, where X is a log-normal random variable with a mean parameter of 0.15 and a
standard deviation parameter of 0.5.
a. Develop a descriptive model of this scenario; identify and name random and non-random
variables along the way. You may develop a flowchart for yourself to help you visualize, but
do not attach it to the submission.
b. List all random variables, their distributions, and parameters.
c. Code the model in Excel and replicate it 10,000 times. Answer the following questions (do
not attach the spreadsheet):
i. What is the weekly average cost of all claims?
ii. Suppose that the company decides to keep $15,000 cash on hand to pay claims. What is
the probability that this amount will not be adequate to cover claims in any given week?

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