A relay microchip in a telecommunications satellite has a life expectancy that follows a normal distribution with a mean of 93 months and a standard deviation of 3.1 months. When this computer-relay microchip malfunctions, the entire satellite is useless. A large London insurance company is going to insure the satellite for 50 million dollars. Assume that the only part of the satellite in question is the microchip. All other components will work indefinitely.
(a) For how many months should the satellite be insured to be
90% confident that it will last beyond the insurance date? (Round
your answer to the nearest month.)
months
(b) If the satellite is insured for 84 months, what is the
probability that it will malfunction before the insurance coverage
ends? (Round your answer to four decimal places.)
(c) If the satellite is insured for 84 months, what is the expected
loss to the insurance company? (Round your answer to the nearest
dollar.)
$
(d) If the insurance company charges $3 million for 84 months of
insurance, how much profit does the company expect to make? (Round
your answer to the nearest dollar.)
$
a)
for 90% sure critical z value= | -1.28 | |||
corresponding period=μ+z*σ = | 89.032 ~ 89 months |
b)
P(X<84)=P(X<(84-93)/3.1)=P(Z<-2.9)= | 0.0019 |
c)
expected loss= | 50000000*0.0019= | 95000 |
d)
profit=Premium charged-expected value = | 2905000 |
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