70, 75, 80, 85, 90, 105, 105, 130, 130, 130 The list shown consists of the times, in seconds, that it took each of 10

70, 75, 80, 85, 90, 105, 105, 130, 130, 130

The list shown above consists of the times, in seconds, that it took each of 10 schoolchildren to run a distance of 400 on of meters. If the standard devastation of the 10 running times is 22.4 seconds, rounded to the nearest tenth of a second, how many of the 10 running times are more than 1 standard deviation below the mean of the 10 running times?

A. one
B. two
C. three
D. four
E. five

Answer: B

Source: GMAT Prep

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