Use the data given below to answer the following question(s) .
The table below shows the sales of a gaming console for the first 6 months of the year 2011.
The forecaster uses the weighted average model to determine the forecasts.He assumes a 40% weight for the most recent reading,30% weight for the second most recent reading,20% for the third most recent reading,and 10% for the fourth most recent reading. 
-Using the given data,calculate the value of the mean square error.
Definitions:
Prescriptive Analytics
The aspect of data analytics that focuses on providing advice or recommendations to optimize decision-making processes.
Explanatory Analytics
Involves the use of data and statistical techniques to clarify why certain trends or outcomes have occurred, providing insights into past performance.
Workforce Analytics
How HR metrics, such as turnover and employee engagement, are used to describe the workforce.
Service Delivery Model
The method or approach by which a company provides services to its customers, including the processes, people, and technology involved in delivering the service.
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