The actual and forecast values of a time series are shown below. 
a.Calculate the mean absolute deviation (MAD).
b.Calculate the sum of squares for forecast error (SSE)
Definitions:
Simulated Service
A technique in service design where a service is tested using simulations to identify potential issues and improvements before actual implementation.
Monte Carlo Analysis
A problem-solving technique that uses random sampling and statistical modeling to estimate mathematical functions and simulate the probability of different outcomes in a process.
Average Service
The mean level of service quality provided by an organization, gauged over a specific period or across various service instances.
Random Process
A sequence of unpredictable events in which the outcome of any specific event cannot be accurately predicted.
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