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Probability Old Exam P Forum

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  #1  
Old 08-03-2012, 12:22 PM
winst0n winst0n is offline
 
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Default SOA May 2003 P Sample Question 32

They give us F(x) = 0, X <1; (x^2 - 2x +1)/ 2, 1<=x <2; 1, x>2

They ask use to find Var(x)...

Can anybody explain how f(x) = 1/2 for X = 1?

I can't seem to back out the 1/2 from my calculations.

Thanks in Advance!
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Old 08-03-2012, 12:30 PM
Actuarialsuck Actuarialsuck is offline
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Check the endpoints. There's a few threads on this question already, search the AO.
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Old 08-03-2012, 12:43 PM
winst0n winst0n is offline
 
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I can't find the thread... can you link?

I caculated the endpoint at x = 1 is 0.... not 1/2
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Old 08-03-2012, 01:54 PM
daaaave daaaave is online now
David Revelle
 
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See http://www.actuarialoutpost.com/actu...d.php?t=238212
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Old 08-03-2012, 04:22 PM
Actuarialsuck Actuarialsuck is offline
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Quote:
Originally Posted by winst0n View Post
I can't find the thread... can you link?

I caculated the endpoint at x = 1 is 0.... not 1/2
Another way you can test if you're doing it right is if you figure out your f(x), you should be able to integrate over the support. If you integrate a pdf over its support you should get the same value regardless of the pdf, are you getting that value?
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