The data in the following table represent time-study observations for an assembly process. On the basis of these observations, find the standard and normal time for the process. Assume a 10% allowance factor.

Elemen t

Performance Rating (%)

Observations

1

2

3

4

100

90

120

100

1	2	3	4	5
1.5	1.6	1.4	0.1*	1.5
2.3	2.5	2.1	2.2	2.4
1.7	1.9	1.9	1.4	1.6
3.5	3.6	3.6	3.6	3.2

* disregard possible error