Here are some articles about what mathematical knowledge is needed and used at the workplace:
Noss, R. (2002). Mathematical Epistemologies at Work. For the Learning of Mathematics, 22(2), 2–13.
Smith, J. P. (1999). Tracking the Mathematics of Automobile Production: Are Schools Failing to Prepare Students for Work? American Educational Research Journal, 36(4), 835–878. doi:10.3102/00028312036004835