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# In 1995, Division A of company X had 4,850 customers. If

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In 1995, Division A of company X had 4,850 customers. If [#permalink]

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30 Apr 2006, 07:48
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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.
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30 Apr 2006, 15:04
Service error rate in div A=86/4850 *100=1.77

statement 1:
Combined Service Error rate=1.5 but no mention of total number of Customers or the number of customer in Div B. Insufficient.

Statement2:
No. of Customers=9350 in Div B but no mention of Service errors so not possible to find no. of errors per 100 customers. Insufficient.

Combining Both the statements,
Total no. of customers=9350+4850=14200
Service error/100 customer= 1.5
Total no. of service error=1.5*14200/100
=213
Service error in B=213-86=127
service error/100 customer in B = (127/9350) *100
=1.35(ANS)(C)
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30 Apr 2006, 15:04
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