BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

service errors rate

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 275
Joined: Wed Jul 02, 2008 4:19 am
Thanked: 4 times

service errors rate

by Xbond » Wed Jun 10, 2009 12:22 pm
Hi there,

I don't understand to this question. I don't know how to start. Many thks to explain the concept and reasoning the most simplest

In 1995 Division A of Company X had 4 850 customers. if there were 86 service errors in Division A that year was the service-error rate, in number of service errors per 100 customers, for Division B of company X in 1995 ?

(1) In 1995, the overall service error rate for Divisions A and B combined was 1.5 service errors per 100 customers

(2) In 1995 Division B had 9 350 customers, one of whom were customers of Division A


Answer C
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 752
Joined: Sun May 17, 2009 11:04 pm
Location: Tokyo
Thanked: 81 times
GMAT Score:680

by tohellandback » Wed Jun 10, 2009 8:06 pm
are you sure you have typed the question correctly. It looks awkward
The powers of two are bloody impolite!!
Top
Master | Next Rank: 500 Posts
Posts: 275
Joined: Wed Jul 02, 2008 4:19 am
Thanked: 4 times

by Xbond » Thu Jun 11, 2009 12:03 pm
Yes, you're right. I fix it now :


In 1995 Division A of Company X had 4 850 customers. if there were 86 service errors in Division A that year, what was the service-error rate, in number of service errors per 100 customers, for Division B of company X in 1995 ?

(1) In 1995, the overall service-error rate for Divisions A and B combined was 1.5 service errors per 100 customers

(2) In 1995 Division B had 9 350 customers, none of whom were customers of Division A
Top
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Wed Jun 17, 2009 8:02 am
Thanked: 1 times

by TBombadill » Sun Jun 21, 2009 3:10 pm
Hi, got the same doubt with this one.
Thx!
Top
User avatar
Legendary Member
Posts: 575
Joined: Tue Nov 04, 2008 2:58 am
Location: India
Thanked: 18 times
Followed by:4 members
GMAT Score:710

by rahulg83 » Mon Jun 22, 2009 12:23 am
I think that when you look at the question for the first time, you'll feel statement 1 is sufficient.

86*100/4850 + (service error rate of dep B) = 1.5

But on reading statement 2, you can realize that what if the two divisions have some common customers. In that case statement 1 would be insufficient. We can't assume that customers in two departments are mutually exclusive.

Good question..
Hope that helps!!
Top
Master | Next Rank: 500 Posts
Posts: 148
Joined: Tue Jun 09, 2009 11:06 pm
Thanked: 7 times

by pops » Mon Jun 22, 2009 1:57 am
statement 1 alone: Insufficient since we need number of customers of Division B.

statement 2 alone: Insufficient since we dont have any clue for errors in company B.

Together, statement 1 and 2:
Total number of customers A+B = 4850+9350
service errors per 100 customers = 1.5
=> Number of errors in A + B = (4850+9350)*1.5
=> Number of errors in B = (4850+9350)*1.5 - 86
[Number of errors in A + B minus Number of errors in A]

Hence, you get an answer using both statements.
Top
Post new topic Post Reply
• Page 1 of 1