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 Short-Term Actuarial Math Old Exam C Forum

#111
01-29-2016, 11:09 AM
 ActuarialJL1980 Member CAS Join Date: May 2015 Studying for S Posts: 147

can someone explain exercise 4.2 in ASM? Why does E[X^2] = (frequency*(mean^2 + Sigma^2)). Why do we add the mean squared plus sigma squared for the second moment? I've seen this a few times now and must have missed the definition.
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P FM MFE C S 5 6
#112
01-29-2016, 11:22 AM
 ActurialMike Member CAS SOA Join Date: Aug 2014 Posts: 457

Quote:
 Originally Posted by ActuarialJL1980 can someone explain exercise 4.2 in ASM? Why does E[X^2] = (frequency*(mean^2 + Sigma^2)). Why do we add the mean squared plus sigma squared for the second moment? I've seen this a few times now and must have missed the definition.
I haven't started studying this yet so anyone is welcome to correct me but from my P days:

Variance = sigma^2 = E[X^2] - (E[X])^2

Rearranging to solve for the second moment:

E[X^2] = sigma^2 + (E[X])^2
#113
01-29-2016, 01:25 PM
 ActuarialJL1980 Member CAS Join Date: May 2015 Studying for S Posts: 147

ah nice! Thanks for the reminder.
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P FM MFE C S 5 6
#114
01-29-2016, 02:02 PM
 Tauoverpi Member SOA Join Date: May 2015 Location: Pacific Northwest Studying for C Favorite beer: At the moment: Double Mt. IRA Posts: 91

Quote:
 Originally Posted by ActurialMike I haven't started studying this yet so anyone is welcome to correct me but from my P days: Variance = sigma^2 = E[X^2] - (E[X])^2 Rearranging to solve for the second moment: E[X^2] = sigma^2 + (E[X])^2
hehe, this guy
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P FM MFE C
FINA ECON
#115
01-31-2016, 10:49 PM
 zenkei18 Member Non-Actuary Join Date: Jan 2014 College: Angelo State University Posts: 713

I have been trying to study but it's been difficult. I am the kind that knowing how to solve the problem and doing the practice problems becomes boring to me as it is more of a technical regurgitation nature as opposed to learning new stuff, so I am trying to go through the entire manual and summarize key concepts and formulas, then going to try my hand at some practice exams with my review notes. Then after a couple of the practice exams might go back and look at problems that seem different in applying concepts or problems I wouldn't immediately know how to solve. Seemed to work well for MFE the last go around.
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P FM MFE C MLC
#116
02-01-2016, 03:23 PM
 el jefe Member SOA Join Date: Aug 2014 Studying for C Posts: 78

is anybody using mahler manual? I'm starting it today, but I've never used anything besides ASM and ADAPT for any other exams.
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FM P MFE C MLC
VEE
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#117
02-01-2016, 04:59 PM
 Tauoverpi Member SOA Join Date: May 2015 Location: Pacific Northwest Studying for C Favorite beer: At the moment: Double Mt. IRA Posts: 91

Quote:
 is anybody using mahler manual? I'm starting it today, but I've never used anything besides ASM and ADAPT for any other exams.
I am also using it. It was recommended by a co-worker who had used the same strategy you (and I) have used so far. She passed first try. She said, "It's A LOT of pages, but they go pretty quickly."

Hope that's useful to you, Jefe.
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P FM MFE C
FINA ECON
#118
02-01-2016, 09:44 PM
 Doctuary Member CAS Join Date: Sep 2014 Studying for C/4 Favorite beer: Holy Water Posts: 263

Finally cracked down and started studying today... anyone else using TIA?
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#119
02-02-2016, 08:15 AM
 ActurialMike Member CAS SOA Join Date: Aug 2014 Posts: 457

Quote:
 Originally Posted by Doctuary Finally cracked down and started studying today... anyone else using TIA?
Started two days ago.
#120
02-02-2016, 11:45 AM
 Tauoverpi Member SOA Join Date: May 2015 Location: Pacific Northwest Studying for C Favorite beer: At the moment: Double Mt. IRA Posts: 91

Quote:
 Originally Posted by Doctuary Finally cracked down and started studying today... anyone else using TIA?
I'm in the exact same boat. Time to put the hammer down
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P FM MFE C
FINA ECON