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 Probability Old Exam P Forum

#91
10-16-2007, 06:26 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
October 15, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct15-07p.pdf

Sam Broverman
2brove@rogers.com
#92
10-22-2007, 06:09 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
October 22, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct22-07p.pdf

Sam Broverman
2brove@rogers.com
#93
10-29-2007, 06:22 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
October 29, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct29-07p.pdf

Sam Broverman
2brove@rogers.com
#94
11-05-2007, 11:36 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
Some Time Off

I will resume posting questions in several weeks.

Sam Broverman
2brove@rogers.com
#95
11-29-2007, 12:53 AM
 booyaolian Member Join Date: Feb 2007 Posts: 144

http://www.sambroverman.com/mar27p.pdf

can you explain why is it that f(x|X>200) = f(x) / P(X>200) ?
#96
12-03-2007, 10:33 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639

booyaolian,

The usual formulation for a conditional density
for random variable X=s given event A is the joint
density or probability f(x,A) divided by the
probability (or density) of the conditioning event P(A),
so f(x|A) = f(x,A)/P(A) . Since the event A is X>200
the joint density of f(x,A) is either 0 if x<=200
and is f(x) if x>200 .

SB
#97
12-31-2007, 10:37 AM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
December 31, 2007 Exam P Question

I just had to post one more question before Dick
Clark drops the ball in Times Square.

The question can be found at
http://www.sambroverman.com/pqw/dec31-07p.pdf

Best wishes for a healthy, happy and exam-passing 2008.

--------------------------------------------------------------------------------

Sam Broverman

2brove@rogers.com
www.sambroverman.com
#98
12-31-2007, 12:11 PM
 vjvj Note Contributor Non-Actuary Join Date: Nov 2005 Location: IL Studying for MFE Posts: 7,889

Quote:
 Originally Posted by sam_broverman
The way the problem's worded, the P(first language is English | born outside the region) = .75.
#99
12-31-2007, 12:53 PM
 sam_broverman Member Join Date: Feb 2005 Posts: 639

Vivi,

Thanks, I'll fix that wording.

SB
#100
01-07-2008, 10:12 AM
 sam_broverman Member Join Date: Feb 2005 Posts: 639
January 7, 2008 Exam P Question

The question can be found at
http://www.sambroverman.com/pqw/jan7-08p.pdf

--------------------------------------------------------------------------------

Sam Broverman

2brove@rogers.com
www.sambroverman.com