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• ## Discussion

 0 answersPost by Derui Wang on April 6 at 11:30:11 PMhi, since the formula you given in Transforming random Variables, variance^2=b^2variancex^2, why in example 4 we add on A^2? 1 answerLast reply by: Xiang DongFri Mar 31, 2017 7:56 AMPost by Sandahl Nelson on March 25 at 10:09:30 PMYou need to find the difference that is asked for in the problem. In example 2 it was not specifically specified so you can do either, you just have to specify in your answer which you are subtracting from the other. 0 answersPost by Hioyeuhng Lo on March 25 at 08:11:32 PMhi, i wanna ask in the example  2 , why the different in height is U(w-m), not U(m-w) , because if we do it in U(m-w) we will get a positive number. So i want to ask when we doing this kind of problems , what should we pick first , the bigger number or the smaller number?

### Combining Independent Random Variables

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Objectives 0:09
• Mean and Standard Deviation of Two Random Variables 0:26
• Mean and Standard Deviation of Two Random Variables
• Example I: Average and Standard Deviation 1:58
• Example II: Average and Standard Deviation 4:37
• Transforming Random Variables: “Linear Transformations” 6:10
• Transforming Random Variables: “Linear Transformations”
• Example III: Mean and Standard Deviation 7:02
• Example IV: Mean and Standard Deviation 10:23
• Example V: Mean and Standard Deviation 14:14
• Part 1: Mean & SD
• Part 2: Mean & SD