(Answered) What percent of light bulbs

Statistics

Problem: The average lifespan of a brand X light bulb is 48 months and the variance is 100 months.

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 of 20% of the distribution?

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