Length of its warranty to answer


The lifetimes of TVs produced by Company A are normally distributed with a mean of 75 months and tandard deviation of 8 months.

If company A desires to replace only 1% of its TVs, what should the length of the warranty be?

The company set length of its warranty to answer in (a). Now they want to enhance the reliability of its TV. How much they need to enhance the mean so that they will only replace 0.5% of their TVs given the same warranty?

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Basic Statistics: Length of its warranty to answer
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