If Xi, i = 1, ⋯, n are independent exponential random variables with parameters λ1, ⋯, λn, and if Yi, i = 1, ⋯, n are independent exponential random variables with common parameter equal to (λ1 + ⋯ + ...
Linear combinations of exponential distribution functions are considered, and the class of distribution functions so obtainable is investigated. Convex combinations correspond to hyperexponential ...