Consider a bank branch that has three distinct customer arrival patterns throughout the day, as measured by average arrival rates (below).

Morning (8:30 11:30): arrival 1 = 50/hour.

Lunch (11:30 1:30): arrival 2 = 30/hour.

Afternoon (1:30 4:00): arrival 3 = 25/hour.

Regardless of the time of day, the average time it takes for a teller to serve customers is 2.27 minutes.

Because of competition with other banks in the area, management has determined that they want to keep the average customer wait before service to be less than 7 minutes. With that in mind, answer the following:

a. During the morning period, what is the minimum number of tellers that the bank needs to hire to achieve the 7-minute service objective mentioned above? [ Select ] ["4 tellers", "3 tellers", "2 tellers", "The bank cant hire enough tellers to achieve an average wait before service of under 7 minutes."]

b. During lunch, what is the minimum number of tellers that the bank needs to hire to achieve the 7 minute service objective mentioned above? [ Select ]

d. In the afternoon, what is the minimum number of tellers that the bank needs to hire to achieve the 7 minute service objective mentioned above? [ Select ]