Chapter 12 Linear Algebra in Probability & Statistics

square root is the standard deviation σ or S. After an exam, I email µ and S to the class. I don’t know the expected mean and variance because I don’t know the probabilities p 1 to p 100 for each score. (After teaching for 50 years, I still have no idea what to expect.) The deviation is always deviation from the mean—sample or expected. ................
................