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At 12.00 am on the first day of December, an individual has installed 2500 Led String...

At 12.00 am on the first day of December, an individual has installed 2500 Led String Lights as Christmas tree decoration. These lights have a mean running life of 500 hours with a standard deviation of 100 hours, assume that the running life can be modeled by normal distribution. What is the probability that a randomly selected light will still be running by the end of Christmas day (December 25)?

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