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Tom,
Couldn't you just Poisson it for a quick and dirty approx?
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I tried
this calculator, putting in 45.5 and 45, and it told me that the total would hit exactly 45 ~5.9197% of the time, which sounds reasonable. I wasn't sure how to account for the fact that each of the 8 games must have at least one goal scored, or the fact that the total was actually leaning -115/+105 toward the over, but I figure neither one of those facts would have much impact.
BTW it's a moot point now, since BetJam moved their line up to 45.5.