In: Statistics and Probability
| 
 Past period  | 
 Demand  | 
| 
 June  | 
 125  | 
| 
 July  | 
 250  | 
| 
 Aug.  | 
 285  | 
| 
 Sept.  | 
 410  | 
| 
 Oct.  | 
 485  | 


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