Fungsi sebaran kumulatif itu apa sih? Jelaskan dalam bahasa sunda ya

Dina matematik, fungsi distribusi kumulatip (disingkat cdf) ngajelaskeun probability distribution ti sakabéh nilai-real variabel acak, X. Keur satiap réal number x, cdf dirumuskeun ku

nu mana sisi beulah katuhu ngagambarkeun probabilitas nu mana variabel acak X dicokot tina nilai nu kurang tina atawa sarua jeung x. Probabilitas X aya dina interval (a, b] nyaéta F(b) − F(a) lamun a < b.  Geus ilahar ngagunakeun huruf F gedé keur fungsi sebaran kumulatif, nu jelas béda jeung huruf f leutik nu dipaké keur fungsi dénsitas probabilitas jeung probability mass function.

Fungsi sebaran kumulatif X bisa dihartikeun dina watesan fungsi dénsitas probabilitas f saperti kieu:

Note that in the definition above, the "less or equal" sign, '≤' is a convention, but it is

an important and universally used one. The proper use of tables of the Binomial and Poisson

distributions depend upon this convention. Moréover, important formulas like Levy's inversion formula for the characteristic function also rely on the "less or equal" formulation.