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Apply the 6 8 - 9 5 - 9 9 . 7 Rule. The Paris Marathon in 2 0 1 6 had a mean race

Apply the 68-95-99.7 Rule.
The Paris Marathon in 2016 had a mean race time of 260 mins and a standard deviation of 30 mins. What percentage of race times were slower than 320 minutes?

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