The data below represent time study observations for an assembly operation. Assume a 7% allowance factor. What is the normal time for element 3?
A) 1.7 min.
B) 1.96 min.
C) 2.11 min.
D) 10.1 min.
E) 11.2 min.

Question

The data below represent time study observations for an assembly operation. Assume a 7% allowance factor. What is the normal time for element 3? 
A) 1.7 min. 
B) 1.96 min. 
C) 2.11 min. 
D) 10.1 min. 
E) 11.2 min.

Quizplus · Accepted Answer

To find the normal time for element 3, we need to first find the average observed time by summing up all the observations and dividing by the total number of observations:
6.8 + 1.9 + 1.6 + 1.8 + 1.7 + 2.0 = 15.8
Average observed time = 15.8/6 = 2.63 min
Next, we need to apply the allowance factor of 7% to the average observed time:
Allowance = 0.07 x 2.63 = 0.18
Normal time = average observed time + allowance
Normal time for element 3 = 2.63 + 0.18 = 1.96 min
Therefore, the best choice is B.

The Data Below Represent Time Study Observations for an Assembly