9.5 , 9.8 , 9.9 , 9.9 , 9.9 , 10.2 , 10.3 , 10.5
The mean and the standard deviation of the 8 numbers shown above is 10 and 0.296 respectively. What percent of the 8 numbers are within 1 standard deviation of the mean?
Choose the correct choice from the following options:
A) 90.75%
B) 85.60%
C) 80%
D) 75.25%
E) 62.5%
Within 1 standard deviation of the mean- means in the range {mean-1*sd; mean+1*sd} = {10-1*0.296; 10+0.296} = {9.704; 10.296}.   From the 8 listed numbers, 5 are within this range so 5/8=62.5%.   Answer: 62.5%.
<result>E</result>
9.5 , 9.8 , 9.9 , 9.9 , 9.9 , 10.2 , 10.3 , 10.5
The mean and the standard deviation of the 8 numbers shown above is 10 and 0.296 respectively. What percent of the 8 numbers are within 1 standard deviation of the mean?