operating system doubt

[srikanta s]

hello sir . here i attached my operating system doubt .    as i need answer urgently i am posting here ...  because forum is  not active in these days  .. I am so sorry for this...... 

regards 

Srikanta

[Joy Chowdhury]

hi srikanta,this is interesting question......

 

for sjf(shortest job first) you have to look for priority.here priority 1 is preferred first.so for priority 1 the arrival time is 8.then all the job are executed there already with base of priority.

so the solution is ( (12-8)+(15-5)+(5-2)+(8-0))/4=6.25

Srikanta

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