What fraction of these printers will fail before 1,000 hours

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Reference no: EM131197184

The times of first failure of a unit of a brand of ink jet printers are approximately normally distributed with a mean of 1,500 hours and a standard deviation of 200 hours.

a What fraction of these printers will fail before 1,000 hours?

b What should be the guarantee time for these printers if the manufacturer wants only 5% to fail within the guarantee period?

Reference no: EM131197184

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