Using the table​ above, what is the MSE for months 6−10 for the moving average technique?   *THE ANSWER IS 343 BUT I WANT TO UNDERSTAND WHY AND HOW YOU GET THE ANSWER*

Practical Management Science
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ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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The management of an insurance company monitors the number of mistakes made by telephone service representatives for a company they have subcontracted with. The number of mistakes for the past several months appears in this table along with forecasts for errors made with two different forecasting techniques. The column labeled Exponential was created using exponential smoothing with an alpha of 0.30. The column labeled MA is forecast using a moving average of three periods.
 
Month
Mistakes
Exponential
MA
 
1
55
 
 
 
2
61
 
 
 
3
71
 
 
 
4
77
71
62
 
5
88
73
70
 
6
100
77
79
 
7
109
84
88
 
8
122
92
99
 
9
126
101
110
 
10
126
108
119
 
 
Using the table​ above, what is the MSE for months
6−10
for the moving average technique?
 
*THE ANSWER IS 343 BUT I WANT TO UNDERSTAND WHY AND HOW YOU GET THE ANSWER*
 
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