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  1. L

    weighted variance very short question

    Hi there, I am interested in the asymptotic variance of the weighted sample mean and weighted sample variance. weighted_mean=sum(w(i)x(i)) if one assumes that sum(w(i))=1 and its variance is given by sigma^2*sum(w(i)^2) and is direct result of the central limit theorem. But what about...
  2. L

    basic lotto question

    Hi there, I was always confused with combinations etc but in most cases I was able to find my way out. But this one is really annoying me: Lotto game, possible numbers 1,2,...,49. You play with 6 numbers. What is the probability of actually getting all 6 correct? Easy one, since the...