Iron Fist, Most rely on excel and don't know how to by hand solve the standard deviation equation. The method of calculating the standard deviation is two-fold. First, the variance: you find the mean, subtract the mean from every period value, find the square root of each new value, add all values together and divide by the degrees of freedom, meaning all periods sampled with the exception of one, which is left out of sample. The standard deviation is simply the square root of the variance. As per excel, and how to graph, I haven't a clue in either and it's looking like I'll not be granted one. Good luck.