use the table
| female | male | total
born in the city | 2x | |
not born in the city | 2x | x |
total | 12,000 | | 20,000
the above is from 1)+2)
we can get the x , since 4X=12,000 =>x=3,000
therefore , we can complete the talbe
| female | male | total
born in the city | 6,000 | 5,000 | 11,000
not born in the city | 6,000 | 3,000 | 9,000
total | 12,000 | 8,000 | 20,000
the ans is 11/20
therefore is C
the table can not be shown ?...
^^
[此贴子已经被lisaislisa于2003-1-23 20:49:22编辑过]
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