Let Formula 4 follow a continuous ( uniform ) distribution between Formula 19 and Formula 20 . Let demand , formula _ 4 , follow a uniform distribution ( continuous ) between formula _ 19 and formula _ 20 .
Biar Formula 4 mengikut pengagihan berterusan (seragam) antara Formula 19 dan Formula 20. Biar permintaan, formula_4, mengikut taburan seragam (terusan) antara formula_19 dan formula_20.