Find the average and the standard deviation for the following data. Please show the procedure "longhand" using only x1, x2, and x3. Then, use a calculator to calculate the average and standard deviation for x1 through x12. i know how to find the average but i dont understand how to findthe standard deviation.
x1=41.46
x2=41.89
x3=42.68
x4=41.95
x5=42.79
x6=41.19
x7=42.56
x8=41.14
x9=41.75
x10=42.45
x11=41.54
x12=42.72