Given a Job which needs to be completed within $30\ min$ for the $99\%$ of the times it's executed and within $20\ min$ for the $95\%$ of the times it's executed.
The Job completion depends on the following 7 tasks:
- 1 x Task $A $
- 1 x Task $B$
- 5 x Task $C$
Task $A, B, C$ need to be completed sequentially, but the 5 iterations for Task $C$ can be started in parallel i.e. Task $B$ gets started when Task $A$ completes and all 5 Task $C$ iterations start together as soon as task $B$ completes.
It's also estimated that Task $A$ and $B$ will take $10\%$ of the time each and $80\%$ of the time will be spent completeting $1$ iteration of Task $C$. Running $5$ iterations in parallel for Task $C$ is assumed to take same amount of time as running only $1$ iteration of Task $C$.
Given the above requirement how can we calculate the $99\%$ and $95\%$ excpected times for Task $A, B, C$ so that the Job requirment of $99\% = 30\ min$ and $95\%=20\ min$ are still met?