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There's a 0.2% no a probability of 0.2 two chance that they have the virus a virus so that's the setup so X is distributed to binomial ...

... to cover is the is the binomial partition bin which is something like I said we will have to cover eventually so if x is a variable that ...

개념원리 확률과 통계 개념설명 이항정리(계수,성질)