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describe probability based on normal distribution

Supposing that flight times from SAN to ATL are exponentially distributed with a mean of 4.5 hours as well as a standard deviation of 0.2 hours. Suppose that you must fly from SAN to ATL weekly for a lucrative consulting engagement for one year (52 flights). describe what is the probability that your mean flight time is greater than 4.6 hours over the course of the year?

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