prep 數學一問

krazybon · 发表于 2010-11-2 07:44:46

in 1995, Division A of company X had 4850 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 Division A and B combined was 1.5 service error per 100 customers
2) in 1995 Division B had 9350 customers, non of whom were customers of Division A
OA- C

但是問題是問每百人有幾個error , A 單獨不能解嗎?

Nexusman · 发表于 2010-11-2 07:57:09

條件一裡面沒有Division B的customer人數，
所以即使算出B的service-error，也求不出rate

prep 數學一問

所属分类: GMAT考试

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