Mules are generally known to have fertility problem. How often do mules give birth to a healthy offspring?

usually
about 50% chance
very rarely
never
Mules are considered infertile, but there have been more than 60 documented cases of foals born to female mules around the world (some of them were even DNA-tested to verify the motherhood). There are no recorded cases of fertile mule stallions.
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Answers by country

usually
about 50% chance
very rarely
never
answers
flagthe Netherlands
10%
10%
60%
20%
10
flagAustralia
6%
10%
56%
26%
30
flagIndia
8%
15%
53%
22%
186
flagthe Philippines
0%
31%
50%
18%
16
flagthe United States
3%
26%
43%
24%
327
flagPoland
5%
21%
39%
32%
11876
flagGreece
0%
0%
38%
61%
13
flagPakistan
5%
15%
36%
42%
19
flagthe United Kingdom
7%
24%
34%
30%
104
flagCanada
6%
50%
31%
6%
16
flagRepublic of Ireland
10%
20%
30%
40%
10
flagGermany
11%
23%
29%
33%
77