Noun
convex combination (plural convex combinations)
(linear algebra) A linear combination (of vectors in Euclidean space) in which the coefficients are non-negative and all add up to one.
In a way, you'd say my life is a convex combination of English and mathematics. ... And not only that, I want my kids to be that way: use left brain, right brain at the same time – you got a lot more done. That was part of the bargain. Donald Knuth
Convex combination example Since only the relative weights are relevant, any weighted mean can be expressed using coefficients that sum to one. Source: Internet