New answers tagged probability
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It looks like what they label as $x$ is $v_x$ normalized to have mean 0 and standard deviation 1. It shouldn't be called $x$ really. To get what they call $x$, first you measure a bunch of particle velocities projected onto a single axis of velocity. The velocity of a particle in 3 dimensions would have 3 components and you just take one of them. Then ...
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