Pharmacists enter the production facility of a pharma industry at a rate of 6 persons per hour. In the another facility (2.0 per hour), suppose the workers go to take a break for 2.5 hours. Compute...

Pharmacists enter the production facility of a pharma industry at a rate of 6 persons per hour. In the another facility (2.0 per hour), suppose the workers go to take a break for 2.5 hours. Compute the standard deviation of the number of boxes that would have been packed within that time