If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard
deviation of 500 hours, what percent of the bulbs will not last as long as 2000 hours?
Apply the 68-95-99.7 rule to answer #4 and #5.

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The Answer of If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard
deviation of 500 hours, what percent of the bulbs will not last as long as 2000 hours?
Apply the 68-95-99.7 rule to answer #4 and #5.

If Light Bulbs Have Lives That Are Normally Distributed with a Mean