An electronics manufacturer makes remote control devices for interactive-cable-TV systems. The following assembly tasks must be performed on each device.

Task	Description	Predecessor(s)	Time (min.)
A	Place circuit into circuit frame	--	0.50
B	Solder circuit connections to central circuit control	A	0.70
C	Place circuit assembly in device frame	B	0.40
D	Attach circuit assembly to device frame	C	0.30
E	Place and attach display to frame	--	0.30
F	Place and attach keypad to frame	--	0.20
G	Place and attach top body of device to frame	E, F	0.35
H	Place and attach battery holder to frame	D	0.40
I	Place and attach bottom body of device to frame	G, H	0.60
J	Test device	I	0.30

Draw the precedence diagram for this problem, then determine the following:

a. What is the sum of the task times? [ Select ] ["25.9", "4.67", "4.05", "5.34"] minutes

b. What cycle time will allow the production of 200 units over a ten-hour day? [ Select ] ["1.78", "3.9", "15", "3"] minutes

c. What is the theoretical number of workstations needed? [ Select ] ["2", "1", "3", "5"]

d. What is the actual number of stations? [ Select ] ["3", "5", "2", "1"]

e. Was there an opportunity to improve the balance of the line based on cycle time? [ Select ] ["no", "yes"] If so, what is the new cycle time, idle time and efficiency? [ Select ] ["2.5; 1.45; 83.7%", "3.2; 2.1; 55.6%", "3.0; 1.95; 67.5%", "same as the original calculation", "2.8; 1.55; 72.3%"]

f. Based on your answer to e. what is the total idle time over the 10 hour work day, in minutes? [ Select ] ["286.17", "332.14", "312.56", "1.95", "6.53"]