I'm trying to solve this exercise but I am not sure about the correctness.
Exercise: Consider the following measurement data for an interactive system:
- measurement interval: 5 min
- number of users: 50
- number of servers: 10
- average response time per transaction: 20 sec
- Dmax: 1 sec/transaction (the largest service demand at any single center)
- Dtot: 2 sec/transaction (the sum of the service demands at the centers)
- Number of completed transactions: 75
On average, how many useres are thinking?
This is what I tried:
Nnot-thinking = R * X = R * C / T = 5
Nthinking = N - Nnot-thinking = 45
Where:
- R is the response time
- X is the throughput
- C is the number of completed transaction
- T is the measurement interval
- Nnot-thinking is the number of users that are not thinking
- N is the number of users
- Nthinking is the number of thinking users