Mixing should include blending the ingredients in a predetermined proportion, and using a mortar hoe and power mixer, according to industry standards.
IRC: Chapter 4 (https://codes.iccsafe.org/content/IRC2018/chapter-4-foundations), section R404, and Chapter 6 (https://codes.iccsafe.org/content/IRC2018/chapter-6-wall-construction) explain mortar and cement contents and strength, based on use and application.
Process/Skill Questions:
NCCER Standards:
Masonry: Level One (L1NCCT28)