The lifespan of laptops is normally distributed with a mean of 3.9 years and a standard deviation of 1 year. The lifespan of mobile tablets is normally distributed with a mean of 3.5 years and a standard deviation of 0.5 years。A tablet manufacturer claims that their tablet's lifespan is in the top 5% of the population Find the minimum lifespan needed to be in the top 5%. please explain it to me
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