These data show the ring size for a sample of 8 men 12 10 11.5,11.5, 12, 9, 9 , 11 what is the best approximation of the standard deviation of the ring size data

Standard deviation of ring size is 1.253

Step-by-step explanation:

We are given the following data-set:

12, 10, 11.5, 11.5, 12, 9, 9, 11

n = 8

Formula:

where are data points, is the mean and n is the number of observations.  

Sum of squares of differences = 1.5625 + 0.5625 + 0.5625 + 0.5625 + 1.5625 + 3.0625 + 3.0625 + 0.0625 = 11

24 units

step-by-step explanation: