Comparison of Probability vs Likelihood Functions

확률 함수 vs. 가능성 함수 의 비교
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과연, 확률과 가능성은 같은 것인가? 유사하면서도 다른 개념인가?
In this video, we assumed that our gaussian random variables, X_{i}'s, are independent with one another, having the same means and the same variances.