Independent random variables max and min

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Proggy99
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Homework Statement


Let X and Y be two independent random variables with distribution functions F and G, respectively. Find the distribution functions of max(X,Y) and min(X,Y).


Homework Equations





The Attempt at a Solution


Can someone give me a jumping off point for this problem? All I can think of is that the distribution function for max(X,Y) is F for X>Y and G for Y>X. That seems a little too simple though.
 
Let H(t) be the distribution function of max(X,Y). What does the definition of distribution function say that H(t) is equal to?
 
Billy Bob said:
Let H(t) be the distribution function of max(X,Y). What does the definition of distribution function say that H(t) is equal to?

I am really struggling with the material since the midterm, so I am not sure I know what you are asking. Are you referring to H(t) = P(X [tex]\leq[/tex] t) ?
 
Proggy99 said:
Are you referring to H(t) = P(X [tex]\leq[/tex] t) ?

Exactly! Only in this case it is max(X,Y) instead of X.

Now, think about it means for max(X,Y) to be [tex]\leq[/tex] t. What must be true about X and/or Y?
 
Billy Bob said:
Exactly! Only in this case it is max(X,Y) instead of X.

Now, think about it means for max(X,Y) to be [tex]\leq[/tex] t. What must be true about X and/or Y?

it means that
P(max(X,Y) [tex]\leq[/tex] t) =
P(X [tex]\leq[/tex] t)P(Y [tex]\leq[/tex] t) =
F*G

yes, no, maybe?

this part for min(x,y) i am pretty sure was wrong, so looking into it more.
 
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