Race times at the local monthly 5k run are normally distributed, with a mean time of 32 minutes and a standard deviation of 4 minutes. Using the empirical rule, approximately what percent of racers cross the finish line between 28 and 36 minutes?

Question

Vocaloid · Answer

the standard deviation is 4
therefore, 28 is 1 standard deviation below 32 and 36 is 1 standard deviation above 32

so you should be looking for the % between -1 SD and 1 SD

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