Please help with this I am struggling, Research shows the average cell phone will be 26 months befor 1 answer below »

Please help with this I am struggling,
Research shows the average cell phone will be 26 months before repairs are needed. If the standard deviation for the data is 6 months, what length of time should be set for a warranty such that less than 10% of all phones will need repairs during the warranty period.
Thank you

 

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