Wager tradutor Francês

So, my girlfriends and I, we have a wager going.

Mes copines et moi avons un petit pari.

Which I'd wager she knew would be the case.

J'imagine qu'elle le sait.

I'd wager you're right.

Sans doute, oui.

It is a strange wager for the captain.

C'est un pari étrange pour le capitaine.

So why would a captain make the wager in the first place?

Alors pourquoi le capitaine ferait la pari en premier lieu?