Question:

The amount of time a certain brand of light bulb lasts is

Last updated: 7/8/2022

The amount of time a certain brand of light bulb lasts is

The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1400 hours and a standard deviation of 50 hours. Using the empirical rule, determine what interval of hours represents the lifespan of the middle 68% of light bulbs.