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 Oct27 asked what happens when you apply logarithm transformation to a data? Oct25 accepted What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6? Oct25 comment What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6? for the second term are you sure it's $P(X<8)$ not $P(2 2)$ of a normal distribution when mean is 10, and standard deviation is 6? edited tags Oct25 asked What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6? Oct21 asked Stratified random sampling Oct18 accepted Why is the greatest and least values for each group in these 2 frequency distribution unknown? Oct17 revised Why is the greatest and least values for each group in these 2 frequency distribution unknown? added 8 characters in body Oct17 asked Why is the greatest and least values for each group in these 2 frequency distribution unknown? Oct17 accepted Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ Oct17 comment Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ is that correct? Oct17 comment Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ $P(X=0) = {20 \choose 0}(0.5)^0(0.5)^{20}, P(X=1)={20 \choose 1}(0.5)(0.5)^{19}, P(X=2)={20 \choose 2}(0.5)^2(0.5)^{18}$ etc etc? Oct17 comment Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ i think you've posted how $np(1-p)$ is derived, but can you show me how you'd substitute the numbers from this particular question (20 games 0.5 chance of winning). you don't have to write all 20, just write the first few then use "dot dot dot" ... Oct17 comment Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ @Max you are correct. I made the correction. thank you Oct17 revised Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ added 14 characters in body Oct17 asked Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ Oct11 accepted By convention $P[X=x] = 0$ for all x. How would you explain pdf $f(x) =3x^2$ (where x is between 0 and 1) when x =0.9 Oct11 comment By convention $P[X=x] = 0$ for all x. How would you explain pdf $f(x) =3x^2$ (where x is between 0 and 1) when x =0.9 @AndréNicolas i understand that part. but do you know what does $f(0.9)$ yield? Oct11 comment By convention $P[X=x] = 0$ for all x. How would you explain pdf $f(x) =3x^2$ (where x is between 0 and 1) when x =0.9 @chris ok, i see. then what do i get when I plug in 0.9 for x? Oct11 revised By convention $P[X=x] = 0$ for all x. How would you explain pdf $f(x) =3x^2$ (where x is between 0 and 1) when x =0.9 added 3 characters in body