The loss due to a fire in a commercial building is modeled by a random variable X

with density function

f(x)={0.005(20-x) 0<x<20

{ 0 otherwise

Given that a fire loss exceeds 8, what is the probability that it exceeds 16

In the solution, why is it that the integral goes from x to 20???

with density function

f(x)={0.005(20-x) 0<x<20

{ 0 otherwise

Given that a fire loss exceeds 8, what is the probability that it exceeds 16

In the solution, why is it that the integral goes from x to 20???

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