T3-a (14) T2 (13) T3-b T4 Туре А (10) (18) T3-c Туре A or B? T1 T7 (11) (12) (10) Туре В T5 T6 (15) (22) A FIGURE 5.11 Clow for Derherele Doutio e Cue
3. Figure 5.11 details the process flow for two types of custom-
ers who enter Barbara’s Boutique shop for customized dress
alterations. After step T1, Type A customers proceed to step T2
and then to any of the three workstations at T3, followed by
steps T4 and T7. After step T1, Type B customers proceed to
step T5 and then steps T6 and T7. The numbers in parenthe-
ses are the minutes it takes to process a customer.
a. What is the capacity of Barbara’s shop in terms of the
numbers of Type A customers who can be served in an
hour? Assume no customers are waiting at steps T1 or T7.
b. If 30 percent of the customers are Type A customers and
70 percent are Type B customers, what is the average
capacity of Barbara’s shop in customers per hour?
c. Assuming that the arrival rate is greater than five custom-
ers per hour, when would you expect Type A customers to
experience waiting lines, assuming no Type B customers
in the shop? Where would the Type B customers have to
wait, assuming no Type A customers?
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