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Mathematics 10 Online
OpenStudy (anonymous):

The weight of parcels sent with a certain delivery company has a normal distribution with a mean of 10 pounds and a standard deviation of 2 pounds. The delivery company wishes to establish a weight limit w beyond which there will be surcharge. What value w should be chosen so that 9% of all parcels will have a surcharge?

OpenStudy (phi):

Do you know how to read a Z table? It looks like 1.34 standard deviations above the mean will cover 91% of all samples

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