A Word Problem II

DanaJ: Site Admin; Posts: 2567; Joined: Thu Jan 01, 2009 10:05 am; Thanked: 712 times; Followed by:550 members; GMAT Score:770

by DanaJ » Thu Feb 12, 2009 7:48 am

You are actually looking for the ratio of defective chips for the four shipments to the total number of chips. This is equal to (2 + 5 + 6 + 4)/(5 000 + 12 000 + 18 000 + 16 000) = 17/51 000 = 1/3 000. This means that 1 chip in 3000 is expected to be defective. Since you have 60 000 chips, you should expect to have 60 000/3 000 = 20 defective chips

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billzhao: Senior | Next Rank: 100 Posts; Posts: 80; Joined: Mon Feb 02, 2009 6:36 am; Thanked: 10 times

by billzhao » Thu Feb 12, 2009 7:54 am

Thanks. I did a wrong calculation...

Yiliang

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