An electrical rm manufactures a 100-watt light bulb, which, according to specications 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.

# An electrical rm manufactures a 100-watt light bulb,

## Solution for problem 4.75 Chapter 4

Probability and Statistics for Engineers and the Scientists | 9th Edition

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An electrical rm manufactures a 100-watt light bulb,