At a large business,
employees must report to work at 7:30 A.M. The arrival times of
employees is approximately symmetric and mound-shaped with mean
7:22 A.M. and standard deviation 4 minutes.

Question
1. Use the 68-95-99.7 rule (also known as
the Empirical rule) to determine what percent of employees
are late on a typical day.

%

Question
2. A psychological study determined that the typical
worker needs four minutes to adjust to their surroundings before
beginning their duties. Use the 68-95-99.7 rule
(also known as the Empirical rule) to determine what
percent of this business employees arrive early enough to make this
adjustment before the 7:30 A.M. start time.

%