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 2d awarded Notable Question Jan 26 awarded Popular Question Oct 23 awarded Editor Oct 23 revised Find a constant in a density function typo mistake Oct 23 suggested approved edit on Find a constant in a density function Oct 23 comment How to calculate MEAN of exponential distribution? Why it's not $E[(X+5)^2]=E[X^2]+10E[X]+E[5^2]$ but $+5$? Oct 23 comment How to calculate MEAN of exponential distribution? Why it's not $E[(X+5)^2]=E[X^2]+10E[X]+E[5^2]$ but $+2E[X]$? Oct 23 comment How to calculate MEAN of exponential distribution? Sorry. Can you show the steps why $E[(X+5)^2]=E[X^2]+2E[X]+E[5^2]$? Oct 22 comment How to calculate MEAN of exponential distribution? Can you explain a little bit more on $E((X+5)2)=E(X2)+10E(X)+5$? I'm quite confused. Oct 22 accepted How to calculate MEAN of exponential distribution? Oct 22 awarded Scholar Oct 22 comment How to calculate MEAN of exponential distribution? Is $E[X] = \frac1\lambda$? Then $E[X] = 5$. Can we use the similar method to find out $E[(x+5)^2]$ ? Oct 22 comment How to calculate MEAN of exponential distribution? I know $E[X]$ = 5 but I've no idea about $E[(X+5)^2]$ Oct 22 comment How to calculate MEAN of exponential distribution? I know $E[X]$ means the mean/expected value of $f(x)$ Oct 22 revised How to calculate MEAN of exponential distribution? edited tags Oct 22 asked How to calculate MEAN of exponential distribution?