The instruments used to measure are in itself part of the observation that decides the probability and thus affects the outcome of the "experiment".. as we can't remove ourselves from the universe to observe it. Thus it all goes around, like clockworks. The free will in all this would be in which way we choose to alter the universe (by making an observation in a physics experiment, for example) and which probability was going to be realized from all the infinite possibilities. It's counter-intuitive, I know - but I make no claims of understanding it. But picturing it this way works for me at least.
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