In a factory producing parts for an electronic appliance, the length of a large  number of parts were measured. The mean and standard deviation were  calculated as 3 mm and 0.05 mm respectively. Assuming the data are normally  distributed, between what values do the lengths of the middle 99.7% of the parts  fall?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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In a factory producing parts for an electronic appliance, the length of a large 
number of parts were measured. The mean and standard deviation were 
calculated as 3 mm and 0.05 mm respectively. Assuming the data are normally 
distributed
, between what values do the lengths of the middle 99.7% of the parts 
fall? 

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