Concept explainers
To Find: The number of month to which the guarantee should the guarantee to be limited.
Answer to Problem 18E
The manufacture must limit to 72.5 months guarantee.
Explanation of Solution
Given:
The mean length is 61 months and the standard deviation is 5 months.
The manufacturer do not want to replace any more than 2% of the CD players.
Calculation:
The objective to obtain the limit above which the 2% level of confidence is obtained.
The range of the interval about the mean has
The range of the interval is obtained by the formula,
Here, the value of
Then, the number of months to which manufacturer must limit the guarantee is,
Thus, the manufacture must limit to 72.5 months guarantee.
Chapter 14 Solutions
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
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