The mean and the standard deviation of the $8$ numbers shown above are $10$ and $0.3$ respectively. What percent

$\{9.4 , 9.9 , 9.9 , 9.9 , 10.0 , 10.2 , 10.2 , 10.5\}$

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

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