Mathematics, 09.11.2019 00:31 Jamilia561

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.

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An electrical firm manufactures a 100-watt light bulb, which, according to specifications written on...