A time analyst observed a job for which the work methods have just been changed. The job is divided into four work elements. The element times for the first five cycles, recorded on a continuous basis, are shown in the following table with a performance rating (RF) for each element

Cycle Times:

Element:	1	2	3	4	5	RF
1	0.50	3.30	5.70	8.20	10.85	1.10
2	0.70	3.45	5.95	8.55	11.10	1.20
3	1.45	4.05	6.50	9.25	11.75	1.20
4	2.75	5.25	7.60	10.35	13.00	0.90

A. Calculate the normal time for this job

B. Calculate the standard time for this job, assuming that the allowance is 20%

C. What is the appropriate sample size for estimating the time for element 2 within +/-10% of the true mean with 95% confidence?

D. What is the sample size needed for a precision of +/-5%?