A Customer Wants Delivery to Be Ensured Between 10 Am

Multiple Choice

A customer wants delivery to be ensured between 10 am and 2 pm. Your truck leaves the factory at 4 am and the time taken to reach the customer is normally distributed with an average of 8 hrs and a standard deviation of 1 hr.
-What is the process capability ratio of the process?

A) 0.67
B) 0.50
C) 1.00
D) 2.00
E) None of the above