i need help with questions 27 and 31 of Oliverlehmann.
Can someone please explain?
Tue, 06/04/2013 - 12:46
Tue, 06/04/2013 - 14:00
Q27) Standard deviaitoin for ranges always you need calculate the SD for individual P-O/6
Then Calculate the variance for each of the SD calculated, ( P-O/6)^2
Then add up the variances to find the final value of SD
SD 24-12/6= 12/6=2, variance=square of 2=4SD 14-8/6=6/6=1, variance=1SD 27-15/6=12/6=2, variance =4SD 28-10/6=18/6=3, variance=9SD 35-17/6=18/6=3, variance=9
now add up all variances= 4+1+4+9+9=27now take sq root of 27=5.2
Tue, 06/04/2013 - 14:20
Act3=5 days with FF-2 days
Act 4=6 days with FS+3
Now since we have FF relationship and lead of 2days, will consider Act3 will finish along with Act2 and since there is lead of 2 days, then it should deducted from next Act4
so, Act1 (20days) + Act2 (10days)+ Act4 (6days) +3 days for lag - 2 days for lead
20+10+6+3-2= 37 days
Note Act3 do not coem into picture for calculation but it's lead time is considered for substracting.
Wed, 06/05/2013 - 03:57
When they say FF between A and B, this means for B to finish (completion of the successor), A must finish first (depends upon completion of the predecissor).
So between Act2 and 3 there is a FF realtionship with -2 (i understood it as a lag of 2 days).
Your answer is the right one but also very simple. Just add the numbers....
Tue, 06/04/2013 - 22:45
Thanks both of you. Appreciate your help.
Sun, 01/15/2017 - 16:41
for this question, draw a bar(gantt) chart.
It greatly simplifies the problem.
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