Question

The tool crib at a large manufacturing company is responsible for providing tools to the factory workers on demand. The tool crib has a variable demand.​ Historically, its demand has ranged from 320 to 570 small tools per day with an average of 445. Diane, the tool crib​ attendant, works eight hours a​ day, five days a week. Each order is for one small tool and each small tool takes Diane 1 minute to retrieve from the bins.
What is the average waiting​ time, in​ minutes?

6.4， 5.4， 7.4， 1？

Answer 1

Answer:

6.4 minutes

Explanation:

Average small tool per day = 445

 working hours = 8     so that is 8*60 =  (480 minutes)

Waiting time  =  

$\frac{[445*(\sqrt{1} )]}{[2*[480-(445*1)]]}$  (image of the operation on the attach file)

 =[445]/[(2*35)]

=445/70

=6.357 minutes