Why is Y a Convolution of X1 and X2 PDFs?

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SUMMARY

The discussion centers on the mathematical principle that the probability density function (PDF) of the sum of two independent uniformly distributed random variables, X1 and X2, is derived through convolution. Specifically, when Y = X1 + X2, the PDF of Y is the convolution of the PDFs of X1 and X2. This is established in Theorem 7.1 of the referenced document, which outlines the foundational concepts of convolution in probability theory.

PREREQUISITES
  • Understanding of probability density functions (PDFs)
  • Familiarity with convolution operations in mathematics
  • Knowledge of uniformly distributed random variables
  • Basic principles of random variable summation
NEXT STEPS
  • Study the properties of convolution in probability theory
  • Review Theorem 7.1 in the provided document for detailed explanations
  • Explore examples of convolution with different types of distributions
  • Learn about the Central Limit Theorem and its relation to convolution
USEFUL FOR

Students and professionals in statistics, mathematicians, and anyone interested in understanding the convolution of probability density functions in the context of random variables.

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if X1 and X2 are two uniformly distributed random variables
and if Y = X1 + X2
why is that the probability density function of Y is convolution of probability density functions of X1 and X2 ?

I tried many ways, I'm not able to get at this conclusion
 
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http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/Chapter7.pdf

See Theorem 7.1, just after the start of section 7.2.
 

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