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\(\{9.4 , 9.9 , 9.9 , 9.9 , 10.0 , 10.2 , 10.2 , 10.5\}\)
The mean and the standard deviation of the \(8\) numbers shown above are \(10\) and \(0.3\) respectively. What percent of the 8 numbers are within \(1\) standard deviation of the mean?
A. \(90\%\)
B. \(85\%\)
C. \(80\%\)
D. \(75\%\)
E. \(70\%\)
Answer: D
Source: GMAT Prep
The mean and the standard deviation of the \(8\) numbers shown above are \(10\) and \(0.3\) respectively. What percent of the 8 numbers are within \(1\) standard deviation of the mean?
A. \(90\%\)
B. \(85\%\)
C. \(80\%\)
D. \(75\%\)
E. \(70\%\)
Answer: D
Source: GMAT Prep
