What fraction of batteries is expected to survive beyond

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Reference no: EM132121398

The life of a phone battery is normally distributed with a mean of 1,100 days and a standard deviation of 60 days. Determine the following

a. What fraction of batteries is expected to survive beyond 1,200 days

b. what fraction of batteries is expected to survive fewer than 995 days

c. What length of warranty is needed so that no more than 10% of the betteries will be expected to fail during the warranty period.

Reference no: EM132121398

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