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October 28th, 2015, 01:01 PM  #1 
Newbie Joined: Oct 2015 From: Sweden Posts: 1 Thanks: 0  Probability to find the random variable X within an interval
I have a question from the book Probability, Statistics, and Random Processes for Engineers by Stark and Woods. Their's no answer to the questions in the book so I post the question here and hope for an answer. The problem is stated as follows: Let X be a continuous random variable with pdf \begin{equation} f_X(x)= \begin{cases} 2x,0<x<1\\ 0,otherwise \end{cases} \end{equation} Find P(1/4<X<2)? Do I just have to calculate the integral of $f_X(x)$ from 1/4 to 1 or is there anything else I need to do? I would be thankful for an answer! Last edited by Linder88; October 28th, 2015 at 01:40 PM. 
October 28th, 2015, 07:48 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,856 Thanks: 745  Quote:
 

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find, interval, probability, random, variable 
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