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The mean time taken by all participants to run a

The mean time taken by all participants to run a road race was found to be 220 minutes with a standard deviation of 20 minutes. Using Chebyshev’s theorem, find at least what percentage of runners who ran this road race completed it in

a. 180 to 260 minutes

b. 160 to 280 minutes

c. 170 to 270 minutes

a. 180 to 260 minutes

b. 160 to 280 minutes

c. 170 to 270 minutes

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