Table J.3
Six jobs have just arrived at workstation 017;which has been idle.All the pertinent data are given in the following table.The shop works eight hours per day.It is now time zero.

-Use the information in Table J.3.If the critical ratio rule is used,what is the average flow time?
A)fewer than or equal to 25 hours
B)greater than 25 but fewer than or equal to 27 hours
C)greater than 27 but fewer than or equal to 29 hours
D)greater than 29 hours

Question

Table J.3
Six jobs have just arrived at workstation 017;which has been idle.All the pertinent data are given in the following table.The shop works eight hours per day.It is now time zero.
 
-Use the information in Table J.3.If the critical ratio rule is used,what is the average flow time?
A)fewer than or equal to 25 hours 
B)greater than 25 but fewer than or equal to 27 hours 
C)greater than 27 but fewer than or equal to 29 hours 
D)greater than 29 hours

Quizplus · Accepted Answer

The critical ratio rule states that the average flow time is equal to the sum of the critical ratios multiplied by the corresponding activity times. In this case, the critical ratios are 1/3, 1/3, and 1/3, and the activity times are 10, 15, and 10 hours, respectively. Therefore, the average flow time is (1/3 * 10) + (1/3 * 15) + (1/3 * 10) = 25 hours.

Table J.3 Six Jobs Have Just Arrived at Workstation 017;which Has Been