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16122006 24 cau hoi tai sao luon ton tai uj tai sao

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Unformatted text preview: 137 145 155 165 175 189 79 84 90 94 98 102 107 110 116 118 125 110 115 120 130 135 140 120 136 140 144 145 135 137 140 152 157 160 162 678 750 685 1043 150 152 175 178 180 185 191 966 1211 18 E(Y/Xi) 16/12/2006 80 100 120 140 160 180 200 220 240 260 55 1/5 60 1/5 65 1/5 70 1/5 75 1/5 • *chi tieâu trung bình cuûa caùc hoä gia ñình coù cuøng möùc thu nhaäp X=80USD? • *chi tieâu trung bình cuûa caùc hoä gia ñình coù cuøng möùc thu nhaäp X=100USD? • * choïn ngaãu nhieân 1 hoä gia ñình trong nhoùm hoï coù thu nhaäp 80USD, tính xaùc suaát hoä naøy coù chi tieâu laø 55USD? 19 65 70 74 80 85 88 16/12/2006 X 16/12/2006 240 260 80 93 95 103 108 113 115 325 462 445 707 Y Caâu hoûi: i: 100 120 140 160 180 200 220 55 60 65 70 75 Y 65 1/6 70 1/6 74 1/6 80 1/6 85 1/6 88 1/6 79 1/5 84 1/5 90 1/5 94 1/5 98 1/5 65 77 89 80 1/7 93 1/7 95 1/7 103 1/7 108 1/7 113 1/7 115 1/7 101 102 1/6 107 1/6 110 1/6 116 1/6 118 1/6 125 1/6 110 1/6 115 1/6 120 1/6 130 1/6 135 1/6 140 1/6 120 1/5 136 1/5 140 1/5 144 1/5 145 1/5 135 1/7 137 1/7 140 1/7...
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