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Gmat_mission
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The list shown consist of the times, in seconds, that it took each of 10 school children to run a distance of 400 meters. If the SD of ten running times is 22.4 seconds, rounded to the nearest tenth of second, how many of the 10 running times are more than one SD below the mean of the 10 running times?
A. one
B. two
C. three
D. four
E. five
Answer: B
Source: GMAT Prep
The list shown consist of the times, in seconds, that it took each of 10 school children to run a distance of 400 meters. If the SD of ten running times is 22.4 seconds, rounded to the nearest tenth of second, how many of the 10 running times are more than one SD below the mean of the 10 running times?
A. one
B. two
C. three
D. four
E. five
Answer: B
Source: GMAT Prep
