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प्रश्न
Choose the correct alternative:
The time until the first failure of a brand of inkjet printers is normally distributed with a mean of 1,500 hours and a standard deviation of 200 hours. What proportion of printers fails before 1000 hours?
पर्याय
0.0062
0.0668
0.8413
0.0228
उत्तर
0.0062
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