Ngày tải lên :
28/08/2012, 16:32
... e ¯ ’.’ e 14 18 95 16 30 14 7 29 73 22 36 22 27 72 26 60 30 11 1 37 15 41 36 37 25 26 35 28 42 63 12 7 33 31 57 26 20 79 23 29 40 58 36 31 35 18 33 52 70 41 85 23 15 27 48 28 35 47 11 15 32 ´ ` ... [7, 75 − 8, 25) 11 [8, 25 − 8, 75) 18 [8, 75 − 9, 25) [9, 25 − 9, 75) [9, 75 − 10 , 2) 50 x0 i 6,5 7,0 7,5 8,5 9,5 10 ui -4 -3 -2 -1 ni ui -4 -6 -10 -11 -13 ni u2 i 16 18 20 11 12 95 ’ a Goi X ... sai l` o e a ’ ’’ s2 = n 1 (xi − X)2 = (xi − 95, 5)2 = 0, 7rf f n − i =1 i =1 (a) 20, ± 0, 14 8mm, (b) 20, ± 0, 19 5mm (5092, 89 ; 5484, 89) 0, 12 71 < p < 0, 2729 10 00 10 00 ’ ` ´ ` ’ ˘ Tˆng sˆ chim...