... =0,0359P(0,8391 0,9109) (25 18 27 33 ) sn phm A (1 im)b)TNG TH 21 23 27 29 Ly mu khụng hon li, kớch thc 2, s cú C(4 ,2) = 6 mu, vi phõn phi phng sai mu c nh sau:S 22, 0 18,0 32, 0 8,0 18,0 2, 0P 1/6 1/6 1/6 ... chn c kin K 12, K13 v K23 l h y . (1 im)A l bin c 2 sn phm chn ra u l sn phm loi I.P(A) = P(A|K 12) P(K 12) + P(A|K13)P(K13) + P(A|K23)P(K23) = 0 ,22 67 hay 17/75CU 3 (1 im)Xi (i = 1, 2) s sn phm loi ... X2 ~ B( 50 0,7 )S tin thu c Y = 18(X1 + X2) + 14(100 - X1 - X2) = 4X1 + 4X2 + 1400VarY = 16VarX1 + 16VarX2 = 360 ngn ngCU 4 (2 im)Trng lng (gr) 150 25 0 350 450 550 650S trỏi 10 40 140 110 80 20 ...