What proportion of all undefective devices

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Reference no: EM133345500

Question: Undefective devices are expected to last, on average, 365 hours. Suppose that the time until failure of an undefective device follows the normal distribution with a mean of 365 hours and a standard deviation of 20 hours. What proportion (rounded to two decimals) of all undefective devices will last between 355 and 380 hours? Also, what length of time (rounded to whole numbers) marks the shortest 80.23% of all undefective devices?

Reference no: EM133345500

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