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The lifetimes of LED s are normally distributed with a mean of 50,000 hours and a stan deviation of 3,500 hours. What is the probability

The lifetimes of LED s are normally distributed with a mean of 50,000 hours and a stan deviation of 3,500 hours. What is the probability that a randomly selected LED light bulb will have a lifetime between 45,000 and 55,000?

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