(Answered) Percent of light bulbs

Statistics

The average lifespan of a brand X battery is 48 months and the variance is 100 months. Use the data to solve. Provide justifications and citations for your responses.

Required:

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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