9.6 , 9.6 , 10.0 , 10.0 , 10.0 , 10.1 , 10.2 , 10.5
The mean and the standard deviation of the 8 numbers shown above is 10 and 0.278 respectively. What percent of the 8 numbers are within 1 standard deviation of the mean? Choose the most appropriate option:
A) 62.5%
B) 85%
C) 80.67%
D) 75.50%
E) 90.30%
Within 1 standard deviation of the mean- means in the range {mean-1*sd; mean+1*sd} = {10-1*0.278; 10+0.278} = {9.722; 10.278}.   From the 8 listed numbers, 5 are within this range so 5/8=62.5%.   62.5%nswer: 62.5%.
<result>A</result>
9.6 , 9.6 , 10.0 , 10.0 , 10.0 , 10.1 , 10.2 , 10.5
The mean and the standard deviation of the 8 numbers shown above is 10 and 0.278 respectively. What percent of the 8 numbers are within 1 standard deviation of the mean?