The life span (in kilometers) for a population of a new brand of tires can be approximated

Question:

The life span (in kilometers) for a population of a new brand of tires can be approximated by a normal distribution, with a mean of 80,000 kilometers and a standard deviation of 1,500 kilometers.

(a) What is the minimum life span that can be in the top 20% of life spans?

(b) What is the maximum life span that can be in the bottom 10% of life spans?

Answer the questions about the specified normal distribution.

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