1. at a local manufacturing plant, employees must complete new machine set ups within 30 minutes. new machine set-up times can be described by a normal model with a mean of 22 minutes and a standard deviation of four minutes.(a) what percent of new machine set ups take more than 30 minutes? (b) the typical worker needs ve minutes to adjust to their surroundings before beginning their duties. what percent of new machine set ups are completed within 25 minutes to allow for this?