Actuarial Outpost
 
Go Back   Actuarial Outpost > Exams - Please Limit Discussion to Exam-Related Topics > SoA/CAS Preliminary Exams > Probability
FlashChat Actuarial Discussion Preliminary Exams CAS/SOA Exams Cyberchat Around the World Suggestions

Search Actuarial Jobs by State @ DWSimpson.com:
AL AK AR AZ CA CO CT DE FL GA HI ID IL IN IA KS KY LA
ME MD MA MI MN MS MO MT NE NH NJ NM NY NV NC ND
OH OK OR PA RI SC SD TN TX UT VT VA WA WV WI WY

Probability Old Exam P Forum

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-03-2012, 01:22 PM
winst0n winst0n is offline
 
Join Date: May 2009
College: Baruch College
Posts: 8
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!
Reply With Quote
  #2  
Old 08-03-2012, 01:30 PM
Actuarialsuck Actuarialsuck is offline
Member
 
Join Date: Sep 2007
Posts: 6,154
Default

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

I can't find the thread... can you link?

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

See http://www.actuarialoutpost.com/actu...d.php?t=238212
__________________

Follow us on Twitter, Facebook, and LinkedIn
Reply With Quote
  #5  
Old 08-03-2012, 05:22 PM
Actuarialsuck Actuarialsuck is offline
Member
 
Join Date: Sep 2007
Posts: 6,154
Default

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?
__________________
Quote:
Originally Posted by Buru Buru View Post
i'm not. i do not troll.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 11:22 AM.


Powered by vBulletin®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
*PLEASE NOTE: Posts are not checked for accuracy, and do not
represent the views of the Actuarial Outpost or its sponsors.
Page generated in 0.63023 seconds with 11 queries