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April 2008 Q3

A

AKS01

Very Active Member
I tried to calculate the value of the initial surplus as I have done previously i.e.
found the mean and variance of the aggregate claims so S is normally distributed
and P(S(1) > u +20) = p(z > (u+20 - 18)/sqrt(18)) but this did not get the same value of u as they have.
I can see they got their values straight from page 18 in the tables to establish their value of u.
Why is this done differently?
 
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