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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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