11.10 Tensile Energy to Break, where applicable, shall be calculated by integrating the energy per unit volume under the stress-strain curve or by integrating the total energy absorbed and dividing it by the volume of the original gage region of the specimen. As indicated in Annex A2, this may be done directly during the test by an electronic integrator, or subsequently by computation from the area of the plotted curve. The result shall be expressed in energy per unit volume, usually in megajoules per cubic metre (or inch-pounds-force per cubic inch). This value shall be reported to two significant figures.
11.11 For each series of tests, the arithmetic mean of all values obtained shall be calculated to the proper number of significant figures.
11.12 The standard deviation (estimated) shall be calculated as follows and reported to two significant figures: