Question:-
time estimates of an activity in a PERT network are :
Optimistic time t0 = 9 days; pessimistic time tp = 21 days and most likely time tm = 15 days. The approximates probability of completion of the activity in 13 days is :
Option (A)
16%
Option (B)
34%
Option(C)
50%
Option(D)
84%
Correct Option:
(A)
Question Solution:
texpected = ((t0 + 4tm + tp) / 6)
= {(9+(4 x 15)+21) / 6} = 15
S.D. = ((b-a) / 6) = ((21-9) / 6) = 2
Z = ((x-`x)/ s) = ((13-15)/2) = -1
P(-1) = 0.1586
~ 0.16
question-answer-faq-8739