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Determining the standard deviation

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7,000 runners enter a local marathon in which they can qualify to enter the NYC marathon if they complete the 26 mile distance in under 3 hrs and 10 mins. Only 6,350 runners complete the race. If finishing times are normally distributed with a mean of 3 hrs and 40 mins and standard deviation of 28 mins, how many runners qualified?

Reference no: EM131215188

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