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» Mathematics » AP Statistics » Combining Independent Random Variables
IV. Probability & Expected Value: Lecture 4 | 18:56 min
Post by Derui Wang on April 6 at 11:30:11 PM
hi, since the formula you given in Transforming random Variables, variance^2=b^2variancex^2, why in example 4 we add on A^2?
Last reply by: Xiang DongFri Mar 31, 2017 7:56 AM
Post by Sandahl Nelson on March 25 at 10:09:30 PM
You 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.
Post by Hioyeuhng Lo on March 25 at 08:11:32 PM
hi, 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?
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