Answer
$\frac{1}{10}$
Work Step by Step
The table shows 9 with the B+ blood type and 1 with the B- blood type, so 10 ($9+1$) have type AB. The whole set of blood donors contained 100.
$\frac{10}{100}=\frac{10\div10}{100\div10}=\frac{1}{10}$
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