A company ships 5000 cell phones. They are expected to last an average of 10,000 hours before needing repair; with a standard deviation of 500 hours. Assume the survival times of the phones are normally distributed. If a phone is randomly selected to be tracked for repairs find the probability of cell phones that need repair, a) after 11,000 hours b) before 9500 hours c) between 8500 hours and 11,200 hours d) exactly equal to 8,888 hours d) Find the 10th percentile survival time of these phones.

A company ships 5000 cell phones. They are expected to last an average of 10,000 hours before needing repair; with a standard deviation of 500 hours. Assume the survival times of the phones are normally distributed. If a phone is randomly selected to be tracked for repairs find the probability of cell phones that need repair, a) after 11,000 hours b) before 9500 hours c) between 8500 hours and 11,200 hours d) exactly equal to 8,888 hours d) Find the 10th percentile survival time of these phones.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Cost control

Cost control or management in property or project management is the process by which managers maintain costs under human resource management, assets, and capital expenditure to ensure that the project ends on a budget basis. Cost management depends on reasonable estimates and ongoing monitoring during the project. As a result, good cost control is essential for any construction business that wants to succeed.

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A company ships 5000 cell phones. They are expected to last an average of 10,000 hours before needing repair; with a standard deviation of 500 hours. Assume the survival times of
the phones are normally distributed. If a phone is randomly selected to be tracked for repairs find the probability of cell phones that need repair,
a) after 11,000 hours
b) before 9500 hours
c) between 8500 hours and 11,200 hours
d) exactly equal to 8,888 hours
d) Find the 10th percentile survival time of these phones.

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