Rugby World Cup - Can Wales win Pool B? Who'll win the tournament?

1.Australia are obviously favourites but can Wales win pool B, best odds are 5/2 with the Aussies at 4/9.
Is 5/2 worth a punt on Wales?

2.Who's gonna win the world cup?
Update: Thanks to those who read, understood and replied appropriately.

pjb1979 you are a crazy fukd up individual and I think you need professional help!
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