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A certain brand of lightbulb has a lifetime expectancy that is approximately normally distributed. The mean is 900 hours with standard deviation of 75 hours.

A certain brand of lightbulb has a lifetime expectancy that is approximately normally distributed. The mean is 900 hours with standard deviation of 75 hours. What is the probability that a lightbulb will work for 7.1 more than 1,000 hours? 7.2 more than 950 hours?

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