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An olympic runner estimates that the probability that she runs the NYC marathon in less that...

An olympic runner estimates that the probability that she runs the NYC marathon in less that 3.5 hrs is 0.8413 and the probability that she completes it in less that 4.5 hrs is 0.9772. Calculate the probability that she finishes in less that 3 hrs. Assume that the marathon running times are normally distributed.

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