There is also an option in BG2 that you can enable allowing you to actually see the 'dice rolls' your characters are making each attack (under Gameplay Options).
As Aurum said, there are many factors that contribute to a successful attack, and the damage that results, ranging from your stats to items your characters might be wearing. Your manual will have information on this - including charts that show the effect individual stats have on your combat abilities, as well as a break-down of the entire combat system.
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Erydian<br />
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