A particular brand of light bulbs is used in a large
Chapter , Problem 6.55(choose chapter or problem)
A particular brand of light bulbs is used in a large manufacturing plant. This brand is known to have a normally distributed life with a mean of 3600 h and a standard deviation of 160 h. After how many hours should all of the bulbs be simultaneously replaced to ensure that no more than 10% of the bulbs fail while in use?
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