a) A study has shown that 25% of all college textbooks have a price of RM 200 orhigher. It is known that the standard deviation of the prices of all college textbooks isRM 10.50. Supposed the price of all college textbooks have a normal distribution, whatis the mean price of all college textbook?b) Given that Noelle Phone company makes smartphones. The life of an iNphonemodel manufactured by this company has a normal distribution with a mean of 5years and a standard deviation of 6 months. The company is to determine thewarranty period for this new iNphone and any phone that needs a major repairduring this warranty period will be replaced free by the company. What should thewarranty period (in months) be if the company does not want to replace more than1% of the iNphone?.

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Answered: a) A study has shown that 25% of all…

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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a) A study has shown that 25% of all college textbooks have a price of RM 200 or higher. It is known that the standard deviation of the prices of all college textbooks RM 10.50. Supposed the price of all college textbooks have a normal distribution, wl is the mean price of all college textbook?