The standard deviation of the lifespan of a certain brand of LED light bulbs is...
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The standard deviation of the lifespan of a certain brand of LED light bulbs is 12 months The quality control department at this company takes a random sample of 70 LED light bulbs and finds the mean lifespan of sample is 148 months What is the probability that this sample mean is within 4 months of the mean of all light bulbs produced by the company Round the solution to four decimal places if necessary P within 4 months of
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