Actuarial Outpost SOA May 2003 P Sample Question 32
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 Probability Old Exam P Forum

#1
08-03-2012, 01:22 PM
 winst0n Join Date: May 2009 College: Baruch College Posts: 8
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.

#2
08-03-2012, 01:30 PM
 Actuarialsuck Member Join Date: Sep 2007 Posts: 6,154

Check the endpoints. There's a few threads on this question already, search the AO.
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 Originally Posted by Buru Buru i'm not. i do not troll.
#3
08-03-2012, 01:43 PM
 winst0n Join Date: May 2009 College: Baruch College Posts: 8

I caculated the endpoint at x = 1 is 0.... not 1/2
#4
08-03-2012, 02:54 PM
 daaaave David Revelle Join Date: Feb 2006 Posts: 3,089

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#5
08-03-2012, 05:22 PM
 Actuarialsuck Member Join Date: Sep 2007 Posts: 6,154

Quote:
 Originally Posted by winst0n 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?
__________________
Quote:
 Originally Posted by Buru Buru i'm not. i do not troll.