The following table includes the information about a monthly time series. 
When the exponential smoothing method with α = 0.1 is applied, what is the MSE?
Definitions:
Type B
Friedman and Rosenman’s term for easygoing, relaxed people.
Hard-Driving
Exhibiting or characterized by aggressive, energetic effort or activity, often in pursuit of a goal.
Type B Personalities
Refers to a personality type characterized by a relaxed, patient, and easy-going nature.
Relaxed
A state of being free from tension and anxiety.
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