The standard error of (begin parenthesis) x, y (end parenthesis) fertility ratio equals 1,930 times
the square root of (begin parenthesis) 0.0000013 plus (begin parenthesis) 810 divided by (begin
parenthesis) 1,930 times 11,561 (end parenthesis) (end parenthesis) plus (begin parenthesis)
1,479 divided by (begin parenthesis) one thousand times 11,561 (end parenthesis) (end
parenthesis) (end parenthesis) equals 25.