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An electrical firm manufactures a 100-watt light bulb which

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An electrical firm manufactures a 100-watt light bulb, which, according to specifications written on the package, has a mean life of 900 hours with a standard deviation of 50 hours. At most, what percentage of the bulbs fail to last even 700 hours? Assume that the distribution is symmetric about the mean (step by step)

Reference no: EM13622737

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