Given the following task time estimates (HOURS),

Task	a	m	b	Predecessor
A	31	40	60
B	15	20	25
C	17	25	41	A
D	15	19	26	A, B
E	20	25	30	C, D
F	18	24	31	E
G	11	18	22	F

a. How long is the project length (round to two decimal places)? [ Select ] ["127.45", "135.78", "134.83", "128.00", "122.89"] .

b. What tasks form the critical path? [ Select ] ["B, D, E, F, G", "A, C, E, F, G", "A, D, E, F, G", "B, C, D, E, F, G", "A, B, C, E, F, G"] , and what is the project variance and standard deviation (round to two decimal places) [ Select ] ["56.33 and 7.51", "50.19 and 7.08", "34.56 and 4.78", "44.35 and 5.34", "58.01 and 8.22"] .

c. How much slack is there in activity C? [ Select ] ["12 hours", "29 hours", "6 hours", "8.34 hours", "0"] How much slack in activity D? [ Select ] ["28.66 hours", "12.78 housr", "6.83 hours", "0, it is on the critical path", "4.56 hours"]

d. What is the probability that the project will be completed in 137 hours? [ Select ] ["62%", "27%", "38%", "47%", "75%"]

e. How many hours would be required to be 85% sure of completion? [ Select ] ["142", "15 additional hours", "157", "same as the original project length", "a reduction of 15 hours"]