hmmm...but 4 weeks is too small of a sample size. you at least have to include every week since xur's first appearance, and even then your data pool is too small to come to any statistically significant conclusions.
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well im assuming that there are no other factors simply a 16.66% chance of it showing up out of the weeks, it should show up 2/12 weeks i showed up 5/12 weeks (as of last week) or 41% of the time.
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yeah, that's disappointing, but i'd be curious to see how the probability spreads out over another twelve or one hundred twenty weeks...maybe this is just a bad streak?