The life of an automotive battery is usually distributed, Ask an Expert

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The life of an automotive battery is usually distributed with mean 900 days as well as standard deviation 35 days. What fraction of such batteries would be anticipated to survive beyond 1000 days?

Answer: Pr{x>1000}=0.0021

How you get to this number? I'm studying different distributions try to elucidate it in that context please!

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