Final answer:
The number of salespersons needed is determined by considering the average available selling time, number of customers, length of sales calls, and required visits per customer. All factors must be accounted for to estimate staffing needs correctly.
Step-by-step explanation:
The number of salespersons needed to serve a firm's customers is contingent upon several factors, including the average available selling time per salesperson, the number of customers to be serviced, the average length of each sales call, and the average number of required visits per customer. To calculate the staffing needs accurately, all of these factors must be considered in conjunction with one another.
Using the given exercise data as a reference, in a scenario where we expect 30 customers per hour, and one customer arrives every two minutes, it is important to understand the staffing levels required to handle customer flow efficiently. This data provides insight into the expected workload and aids in determining the optimal number of salespersons.
For example, if we expect one customer every two minutes on average, and the average service time per customer is known, multiplying these two figures will give an estimate of the total time required to serve all customers. This, in turn, can be used to assess whether the current staffing level is adequate.