Sum of iid gamma distributions
24889
Sum of independent Gamma distributions is a Gamma distribution
158107
Joint density for exponential distribution
68022
Duplication formula for gamma function
155479
Summation of inner products
54002
Finding the distribution of the sum of three independent uniform random variables
61101
Sum of two independent normal distributed random variables
68535
Finding the distribution of sum of Lognormal Random Variables
41930
Mean of $ \sum (X_i - \bar{X})^2$
67354
Relationship between gamma and chi-squared distribution
123822
PDF and CDF of sum of random variables with different distributions
3950
Expected Value of Max of IID Variables
11211
Calculate posterior distribution (gamma-prior, poisson-likelihood)
63391
How to compute the sum of random variables of geometric distribution
15798
Asymptotic distribution of maximum order statistic of IID random normals
112001
The sum of $n$ independent normal random variables.
80430
What is the distribution of the sum of non i.i.d. gaussian variates?
31500
Distribution of the sum of squared independent normal random variables.