# Stats

Running times for 400 meters is usually distributed for young men between 18 and 30 years of age with a mean of 93 seconds and a standard deviation of 16 seconds. What percent of runners with finish after 110 minutes?

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2. 👎 0
3. 👁 109
1. so close to zero that you couldn't tell the difference
... unless, of course, you mean seconds instead of minutes

110 seconds is one second above one standard deviation from the mean

find the z-score (number of standard deviations from the mean)
... and use a table to find the percentage

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2. 👎 0
posted by R_scott

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