mickula
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 Feb 2 awarded Notable Question Jun 10 awarded Notable Question Nov 18 awarded Popular Question Nov 14 awarded Notable Question Sep 24 awarded Autobiographer Apr 2 awarded Popular Question Nov 14 awarded Popular Question Jan 21 comment Poisson distribution, mean time and probability of waiting Well, point for you. Thanks for explaining. When it comes to b) I have to do that foreach k := 1 to 30 probabilities are $0$ and... what next? $P(X < 30 ) = 1-e^{- \lambda k} + e^{- \lambda k+1}$ etc ? Jan 21 comment Poisson distribution, mean time and probability of waiting $P(X < \frac{1}{2} ) = 1-e^{- \lambda \frac{1}{2}}$ ? Jan 21 comment Poisson distribution, mean time and probability of waiting so a) 36/60, sooooo 0,6 minutes?, is the time, right? Jan 21 awarded Supporter Jan 21 accepted Poisson distribution, mean time and probability of waiting Jan 21 awarded Student Jan 21 asked Poisson distribution, mean time and probability of waiting Jan 20 comment Normal probability distribution with absolute value of X Ok, now I see that u did it on-the-fly. Thank you. Jan 20 comment Normal probability distribution with absolute value of X just simply got one more question: when normalizing why didn't you touch -25 and 25? Shouldn't it be $1-P( \frac{-25-30}{5} ... )$ and same for 25? Jan 20 accepted Normal probability distribution with absolute value of X Jan 20 comment Normal probability distribution with absolute value of X I believe I wrongly interpeted absolute value in just added part of my solution. Jan 20 revised Normal probability distribution with absolute value of X added 114 characters in body Jan 20 asked Normal probability distribution with absolute value of X