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by divya23 » Thu Jun 02, 2011 9:07 pm
shipments no of defective chips in shipment total no of chips in shipment
s1 2 5000
s2 5 12000
s3 6 18000
s4 4 16000
a computer chip manufactures expects the ratio of number of defective chips to the total number of chips to equal the corresponding ratio for shipments s1,s2,s3,s4 combined what is the expected number of defective chips in a shipment of 60000 chips
14
20
22
24
25
i cud not get the stmnt corresponding ratio for shipments s1,s2,s3,s4 combined what is the expected number of defective chips in a shipment of 60000 chips

plz help


oa = 20
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by Anurag@Gurome » Thu Jun 02, 2011 9:15 pm
divya23 wrote:shipments no of defective chips in shipment total no of chips in shipment
s1 2 5000
s2 5 12000
s3 6 18000
s4 4 16000
a computer chip manufactures expects the ratio of number of defective chips to the total number of chips to equal the corresponding ratio for shipments s1,s2,s3,s4 combined what is the expected number of defective chips in a shipment of 60000 chips
14
20
22
24
25
i cud not get the stmnt corresponding ratio for shipments s1,s2,s3,s4 combined what is the expected number of defective chips in a shipment of 60000 chips

plz help


oa = 20
Total no. of shipments = 5000 + 12000 + 18000 + 16000 = 51000
Total no. of defective chips = 2 + 5 + 6 + 4 = 17
Let x be the expected number of defective chips in a shipment of 60000 chips.
Then 17:51000 = x:60000
x = 20
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by cans » Thu Jun 02, 2011 9:18 pm
Total no. of shipments = (5+12+18+16)*1000 = 51000
total no. of defective chips = 2+5+6+4 = 17
Given that the ratio of defective:total remains same
thus ratio = 17:51000 = 1:3000
It mean in 3000 chips, 1 chip is defective
in 60,000 chips , 1*60,000/3,000 = 20 chips are defective
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