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hi, can you help me to solve this problem? Using Chebysheff's theorm, you have concluded that at least 75.8% of the 2,394 runners took between

hi, can you help me to solve this problem?

Using Chebysheff's theorm, you have concluded that at least 75.8% of the 2,394 runners took between 62.2 and 78.6 minutes to complete the 10km race. What was the standard deviation of these 2,394 runners?

Thank you.

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