Data Sufficiency

Last one for today

IMO C

based on what rationale?

LSB wrote:based on what rationale?

Stmt 1 , Total customers for B is missing so I cannot find error rate, So it is insufficient

Stmt 2, With just that information I cannot find error rate

1 & 2 combined gives me complete information

I think so A is the ans....becoz st 2....doesnt support. But,
st 1 tells u that R(a) + R(B) = 1.5 / 100 customers......
we can get the rate of A / 100 customers from question itself...then it is easy to find R(b)/ 100 customers.....easily....
hence 1st is sufficient...
Correct me if iam wrong....

with same reasoning IMO: A

whats OA ?

I think so A is the ans....becoz st 2....doesnt support. But,
st 1 tells u that R(a) + R(B) = 1.5 / 100 customers......
we can get the rate of A / 100 customers from question itself...then it is easy to find R(b)/ 100 customers.....easily....
hence 1st is sufficient...
Correct me if iam wrong....

OA is C. I dont get it. I picked A.

gmattester wrote:

LSB wrote:based on what rationale?

Stmt 1 , Total customers for B is missing so I cannot find error rate, So it is insufficient

Stmt 2, With just that information I cannot find error rate

1 & 2 combined gives me complete information

Can you elaborate more ...?

Why cant we calculate service-rate/100 customers for DIV: A from Question itself and then use statement I to get service rate for DIV: B ?

I: This tells us the how many errors there were based on the total customers A + B. We do not know B. Not Suf

II: Tells us total number of B customers. But does not give us a means to find how many errors were produced in division B. Not Suf


Using both we now have the total (A+B) as well as at error rate. Ans C