My Math Forum Simple Probability Question

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 August 26th, 2013, 12:45 PM #1 Newbie   Joined: Oct 2012 Posts: 18 Thanks: 0 Simple Probability Question Let $X \sim Po(3)$ I want to find the smallest integer x so that $P(X \geq x) \leq 0.05$. I started like this: $0.05 \geq P(X \geq x)= 1 - P(X < x), \; P(X=
 August 26th, 2013, 02:56 PM #2 Global Moderator   Joined: May 2007 Posts: 6,785 Thanks: 707 Re: Simple Probability Question X ? x-1 is equivalent to X < x, when x and X are integers. The teacher is quibbling.
 August 26th, 2013, 03:02 PM #3 Newbie   Joined: Oct 2012 Posts: 18 Thanks: 0 Re: Simple Probability Question Alright, thanks!

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