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orma LeDist, chief engineer for Brightwell Electric, knows that the lifetimes of light bulbs are normally distributed with mean 1000 hours and standard deviation 100

orma LeDist, chief engineer for Brightwell Electric, knows that the lifetimes of light bulbs are normally distributed with mean 1000 hours and standard deviation 100 hours. (a) Sketch the distribution of light bulb lifetimes. What is the label for the X-axis of this distribution? (b) Shade the region of this distribution corre-sponding to light bulbs that have a lifetime shorter than 900 hours. By eyeball, what percentage of bulbs have a lifetime shorter than 900 hours?

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