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In an insurance company, each policy has a paper record and

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In an insurance company, each policy has a paper record and [#permalink] New post 11 Sep 2003, 06:12
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1. In an insurance company, each policy has a paper record and an
electric record. For those policies having incorrect paper record,
60% also having incorrect electric record; For those policies having
incorrect electric record, 75% also having incorrect paper record. 3%
of all policies have both incorrect paper and incorrect electric
records. If we randomly pick out one policy, what's the probability
that the one having both correct paper and correct electric records?


Please explain steps..
Senior Manager
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 [#permalink] New post 11 Sep 2003, 09:20
Took me like 5 minutes!!

A=Incorrect Paper Record
B=Incorrect electronic Record
P(A/B)=means probability of ocurring A given that B already happened

Info from the question:
P(A AND B)=0.03
P(A/B)=0.75
P(B/A)=0.6

We want to know 1-P(AUB)

Calculations:

P(B) = 0.03/0.75= 1/25 = 0.04
P(A) = 0.03/0.6 = 1/20 = 0.05

P(AUB)=P(A)+P(B)-P(A AND B)=0.05+0.04-0.03=0.06

1-P(AUB)=0.94


Did I convince anyone?
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 [#permalink] New post 11 Sep 2003, 17:19
MartinMag wrote:
Took me like 5 minutes!!

A=Incorrect Paper Record
B=Incorrect electronic Record
P(A/B)=means probability of ocurring A given that B already happened

Info from the question:
P(A AND B)=0.03
P(A/B)=0.75
P(B/A)=0.6

We want to know 1-P(AUB)

Calculations:

P(B) = 0.03/0.75= 1/25 = 0.04
P(A) = 0.03/0.6 = 1/20 = 0.05

P(AUB)=P(A)+P(B)-P(A AND B)=0.05+0.04-0.03=0.06

1-P(AUB)=0.94


Did I convince anyone?




Hey martin/rich

It cant be this complex..seriously!

Let me wait a while before i tell you the answer..would like to see others participate

Thanks
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 [#permalink] New post 12 Sep 2003, 03:36
Hey Praetorian,

I noticed you are in Houston. How do people in the area view the Rice business school? Where schools do you have your eye on?

Rich
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 [#permalink] New post 12 Sep 2003, 04:09
rich28 wrote:
Hey Praetorian,

I noticed you are in Houston. How do people in the area view the Rice business school? Where schools do you have your eye on?

Rich


Hey Rich

I am so sorry..though i have been here for two yrs now, i have visited Rice just twice..and i dont know too many students there.

Run a search on Google...may be you can find alumni from Jones...you can contact them...and see how it goes..

My target schools...well..i am applying for the Phd program!
And no , i dont have an MBA.

Best of Luck
Praetorian

Last edited by Praetorian on 08 Oct 2004, 05:21, edited 1 time in total.
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 [#permalink] New post 12 Sep 2003, 04:11
Thanks, I'm in D.C. and I Darden is a great school. good luck!

Rich
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 [#permalink] New post 12 Sep 2003, 04:22
I will try a shorter and simpler route:
Let a = incorrect Paper records
b = incorrect Electronic recods
c = Total policies.
Now from problem statement => 0.6a = 0.75b (they are same i.e. the ones having both incorrect paper and electric records)

Also, 0.03c = 0.6a = 0.75b --------- eq 1. (all give same data but in a different way)

Therefore, probability for selecting a policy with both correct electric and paper record = (c - b - a)/c
= 0.91 (substituting a,b from above equation -1 )
am i riht praet. I must say its a very tricky problem.
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Re: PS : records [#permalink] New post 14 Sep 2003, 05:23
praetorian123 wrote:

In an insurance company, each policy has a paper record and an electric record. For those policies having incorrect paper record, 60% also have incorrect electric record; For those policies having incorrect electric record, 75% also having incorrect paper record. 3% of all policies have both incorrect paper and incorrect electric
records. If we randomly pick out one policy, what's the probability
that the one having both correct paper and correct electric records?

Please explain steps..


ok..heres the answer
we use one of the most important probability concepts

P( correct paper and correct electric) = 1- P ( incorrect paper and incorrect electric)

Let T be total policies
Let x be total incorrect paper policies
Let y be total incorrect electric policies

It follows from the problem statement that

0.03T is the number of both incorrect electric and paper policies
0.6x is the number of both incorrect electric and paper ..
0.75y is the number of both incorrect electric and paper...

So now that all are the same, we have

0.03 T = 0.6 x = 0.75 y

x = 0.03 T/0.6 = 5% * T
y= 0.03 T/0.75 = 4 % * T

Vicky , x + y double counts the "BOTH" incorrect part.

So total incorrect paper OR total incorrect electric = x +y - both incorrect

5% T + 4% T - 3% T = 6%

Required Prob = 1 - 0.06 = 0.94

Answer 0.94

Thanks
Praetorian
Re: PS : records   [#permalink] 14 Sep 2003, 05:23
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