8 numbers: 9.4 9.9 9.9 9.9 10.0 10.2 10.5
mean:10
standard deviation 0.3

question: what is the percent of the 8 numbers within 1 standard deviation of the mean?

3X

You just outlined 7 numbers... But still, for the method, why not just

count the numbers within one deviation of the mean(9.7-10.3) and get the

answer readily?

thank you

there should be 8 figures

I misunderstood 1 standard deviation and standard deviation=1

and thinking why the deviation is changing from 0.3 to 1