A worker was observed for four cycles of a repetitive task.The observer used the continuous method for recording the times.The continuous times (in seconds)for each element are: Which one of the following are the "select times" ( )for each element? The first number is the select time for the first element,the second number is the select time for the second element,and so on.
A)19.5,23,25,30
B)1.5,3.5,5,2
C)2,3,2,5
D)1.5,3.5,2,5

Question

A worker was observed for four cycles of a repetitive task.The observer used the continuous method for recording the times.The continuous times (in seconds)for each element are:  Which one of the following are the "select times" (  )for each element? The first number is the select time for the first element,the second number is the select time for the second element,and so on.
A)19.5,23,25,30 
B)1.5,3.5,5,2 
C)2,3,2,5 
D)1.5,3.5,2,5

Quizplus · Accepted Answer

The select time is the time taken by the worker to select the element for processing. It is the time between the end of the previous element and the start of the current element. The continuous times given are the total time taken for each element including the select time. To find the select time, we need to subtract the previous element end time from the current element start time.

For the first element, there is no previous element, so the select time is equal to the start time of the first element which is 1.5 seconds.

For the second element, the previous element end time is the sum of select time and element time for the first element, which is 1.5 + 10 seconds = 11.5 seconds. The current element start time is 14 seconds. So the select time for the second element is 14 - 11.5 = 2.5 seconds.

For the third element, the previous element end time is the sum of select time and element time for the second element, which is 2.5 + 10 seconds = 12.5 seconds. The current element start time is 14.5 seconds. So the select time for the third element is 14.5 - 12.5 = 2 seconds.

For the fourth element, the previous element end time is the sum of select time and element time for the third element, which is 2 + 10 seconds = 12 seconds. The current element start time is 17 seconds. So the select time for the fourth element is 17 - 12 = 5 seconds.

Therefore, the select times for each element are 1.5, 2.5, 2, and 5 seconds, respectively. The best choice is D.

A Worker Was Observed for Four Cycles of a Repetitive