A population of disk drives manufactured by a certain company runs with mean seek time of 10

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A population of disk drives manufactured by a certain company runs with mean seek time of 10 milliseconds with standard deviation of 0.1 milliseconds. What proportion of samples of size 250 would you expect to result in a mean less than 9 milliseconds? What assumptions do we need to make?
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Mathematical Statistics With Applications In R

ISBN: 9780124171138

2nd Edition

Authors: Chris P. Tsokos, K.M. Ramachandran

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