... thi thbi gian thm viec trung binh cria chi ti6t lb 55 gib, cfrng v6i dolech tiOu chudn le 1. V6i mftc y nghia 0, 05, hdi su cdi ti6n c6 thuc su tdc dUng hay kh6ng?Cho bi6t Qo(2 ,58 ) ... III.C6 3 h6p phdn, trong d6 h6p I chira 25 vi6n tdt vb, 5 vi6n xdu, h6p II chfia 10 vi6nt6t vb 5 vi6n xdu, h6p III chira 5 vi6n tdt vb 15 vi6n xdu. Ta gieo mQt con xfic x6c ... kh6ng?Cho bi6t Qo(2 ,58 ) - 0,4 95, O"(1, 65) - 0, 45 v6i Oo(z) -lb 0.99. Tinh xdc sudt dd c6e-o'5u' dA,1t'/n Jo12 +LGhi chf: Cd,n b6 coi, thi, kh6ng gi,d,i, thfuh...