The average lifespan of a brand X battery is 48 months and the variance is 100 months. Use the data to solve. Show all your work. a. What percent of light bulbs last longer than 60 months? b. What percent of light bulbs last between 25 and 55 months? c. What is the highest number of months a light bulb will last that is in the bottom 20% of the distribution?
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