Explain what "two standard deviations from the mean" means and what it tells you about the data from which it is calculated. Then describe a real-world circumstance that you might encounter in which it might be helpful to know the range of values within two standard deviations of the mean of a given set of data.

True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure