A type of cathode ray tube has a mean life of 10,000 h and a variance of
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A type of cathode ray tube has a mean life of 10,000 h and a variance of 3,600. If we take samples of 25 tubes each and for each sample we find the mean life, between what limits (symmetric with respect to the mean) will 50 % of the sample means be expected to lie?
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Related Book For 
Statistics For Business And Financial Economics
ISBN: 9781461458975
3rd Edition
Authors: Cheng Few Lee , John C Lee , Alice C Lee
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