Neighborhood Insurance sells fire insurance policies to local
homeowners. The premium is $300, the probability of a fire is 0.1%,
and in the event of a fire, the insured damages (the payout on the
policy) will be $290,000.
a. Make a table of the two possible payouts on
each policy with the probability of each.
b. Suppose you own the entire firm, and the
company issues only one policy. What are the expected value,
variance and standard deviation of your profit?
c. Now suppose your company issues two policies.
The risk of fire is independent across the two policies. Make a
table of the three possible payouts along with their associated
probabilities. (Round your "Probability" answers to 4
decimal places.)
d. What are the expected value, variance and
standard deviation of your profit?
e. Compare your answers to (b) and (d). Did risk
pooling increase or decrease the variance of your profit?
f. Continue to assume the company has issued two
policies, but now assume you take on a partner, so that you each
own one-half of the firm. Make a table of your share of the
possible payouts the company may have to make on the two policies,
along with their associated probabilities. (Round your
"Probability" answers to 4 decimal places.)
g. What are the expected value and variance of
your profit?
a | Probability of no fire=1-0.001=0.999 | ||||||||
NoFire | Fire | ||||||||
Payout | $0 | $290,000 | |||||||
Probability | 0.999 | 0.001 | |||||||
b | Profit in case of Fire=300-290000= | ($289,700) | |||||||
A | B | C=A*B | D=B-10 | E=D^2 | F=E*C | ||||
Probability | Profit | Profit*Probability | Deviation fromexpected | Deviation Squared | Deviation Squared* Probability | ||||
Fire | 0.001 | ($289,700) | ($289.70) | ($289,710) | $83,931,884,100 | $83,931,884.10 | |||
No Fire | 0.999 | $300 | $299.70 | $290 | $84,100 | $84,015.90 | |||
Total | $10.00 | TOTAL | $84,015,900 | ||||||
Expected Profit | $10.00 | ||||||||
Variance | $84,015,900 | ||||||||
Standard Deviation =Square Root of Variance | |||||||||
Standard Deviation | $9,166 | (SQRT(84015900) | |||||||
c | Probability of 0 Fire =0.999*0.999= | 0.998001 | |||||||
Probability of 1 Fire =2*0.001*0.999= | 0.001998 | 1 | |||||||
Probability of 2 Fire =0.001*0.001= | 0.000001 | ||||||||
Total | 1 | ||||||||
No Fire | One Fire | TwoFire | |||||||
Payout | $0 | $290,000 | $580,000 | ||||||
Probability | 0.998001 | 0.001998 | 0.000001 | ||||||
Profit for No fire | $600 | ||||||||
Profit for One fire | ($289,400) | (600-290000) | |||||||
Profit for two fire | ($579,400) | ||||||||
A | B | C=A*B | D=B-20 | E=D^2 | F=E*C | ||||
Probability | Profit | Profit*Probability | Deviation fromexpected | Deviation Squared | Deviation Squared* Probability | ||||
No Fire | 0.998001 | $600 | $598.80 | $580 | $336,400 | $335,727.54 | |||
One Fire | 0.001998 | ($289,400) | ($578.22) | ($289,420) | $83,763,936,400 | $167,360,344.93 | |||
Two Fire | 0.000001 | ($579,400) | ($0.58) | ($579,420) | $335,727,536,400 | $335,727.54 | |||
TOTAL | $20.00 | TOTAL | $168,031,800 | ||||||
Expected Profit | $20.00 | ||||||||
Variance | $168,031,800 | ||||||||
Standard Deviation =Square Root of Variance | |||||||||
Standard Deviation | $12,963 | (SQRT(168031800) | |||||||
Neighborhood Insurance sells fire insurance policies to local homeowners. The premium is $300, the probability of...
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