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Convolution of distribution integral range 1.Example: Exponential distribution convolution fx+y(z)=intergral from 0 to z fx(x)fy(z-x))dx how...

Convolution of distribution integral range

1.Example: Exponential distribution convolution

fx+y(z)=intergral from 0 to z fx(x)fy(z-x))dx

how we get the range 0 to z???

Better to use mathematics and a graph to explain.

Also, when it ask find the density function X+Y, should I just add two exponential density function together?

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