At a Local Manufacturing Plant, Employees Must Complete New Machine

Multiple Choice

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. What percent of new machine
Set ups take more than 30 minutes?

A) 97.72%
B) 47.72%
C) 2.28%
D) 52.28%
E) none of the above